Sai is the replacement of Sasuke Uchiha in Kakashi Hatake's Team 7, consisting of himself, Naruto Uzumaki, and Sakura Haruno. The name "Sai" is given to him for the purposes of joining Team 7, his actual name being unknown. At a young age, Sai was one of many orphans recruited by Root, an organization that trained him to have no emotions whatsoever to make it easier for him to accomplish missions. He at some point in time met an older member of Root who took a liking to his drawing ability, and Sai came to think of him as a brother within the organization. During their time together Sai enjoyed a life of happiness and looked forward to the time he could spend with his brother in between missions. Eventually, his brother died of illness, and so too did Sai's source of happiness. Alone again, Sai reverted back to the emotionless member of Root he had been trained to be.
Sakon and Ukon are twin brothers who share positions in the Sound Four. "Sakon" means left and "Ukon" means right, which is also the side of the face that each has his bangs fall on. To further help distinguish between the two Sakon wears beads around his neck and Ukon has a somewhat deeper voice. With their Soma no Ko ability, Sakon and Ukon are able to merge with the bodies of others. Ukon generally uses this ability to remain within Sakon's body where he sleeps, having his head protrude from the back of Sakon's neck. Because Ukon spends so much time within his brother's body he is not use to moving about on his own and tires easily when separated, forcing him to return to Sakon to regain his energy after a short time. Despite this, Ukon is a valuable asset in battle for Sakon, as his arms and legs can be used to strengthen Sakon's attacks as well as block attacks that Sakon cannot. When in their level 2 cursed seal form, each is given increased healing abilities and armor as well as becoming ogre-like in appearance. Sakon and Ukon are very twisted and enjoy bad-mouthing the opposition. Orochimaru notes Sakon to be the fastest and strongest member of the Sound Four, traits Sakon is very proud of. When in battle Sakon likes to prolong the fight by toying with the opponent and all the while use unnecessarily powerful techniques. This tendency of Sakon's causes him to slow down the rest of the group whenever he gets interested in an opponent, making him severely more flawed than Jirobo or Kidomaru. Ukon is able to counteract this flaw by being more impatient and hasty than his brother, causing him to quickly end battles while Sakon is still trying to have fun. Sakon and Ukon fight and almost defeat Kiba Inuzuka and Akamaru. Before they can finish the two off, however, Kankuro arrives and kills them both by navigating them into one of his puppet's torso and stabbing them several times, saving Kiba and Akamaru.
Sakumo Hatake also known as Hidden Leaf Village's White Fang, was the father of Kakashi Hatake. Sakumo was the enemy of Chiyo's son. According to the Fourth Hokage, Sakumo was once respected as much as the Legendary Three Ninjas before he fell into disgrace after choosing to save his comrades rather than complete a mission, causing Hidden Leaf Village to suffer in the war effort. This caused many people, including those he had saved, to hate him. Dishonored, Sakumo committed seppuku after deep depression and a drop in his skills, which caused Kakashi to lead his life strictly according to the Ninja code. Sakumo left his White Light Chakra Sabre, for which he was nicknamed, to Kakashi, which utilized chakra to produce a trail of white light from the blade when swung (the blade being the metaphorical "fang"). It was cut in half during a fight between Kakashi and an Iwagakure shinobi.
Sakura at the series' start shows great infatuation towards Sasuke Uchiha. This consists of following him everywhere in an attempt to help him and valuing his opinion and abilities above all others. Once Sasuke begins to be put in more dangerous situations, Sakura's display of her emotions shifts to concern for his well-being, first seen when he appears to have died and she goes against the Shinobi Code by crying for his loss. While his death turns out to be an illusion, Sakura maintains this method of showing her feelings for Part I's duration. The most long-standing example of this is the Cursed Seal Sasuke receives from Orochimaru as a source of power. In addition to worrying for Sasuke when he is left bedridden after the seal's use, Sakura also worries about the seal's potential to draw him away from Hidden Leaf Village. In time, her fears are realized and Sasuke abandons the village to seek out Orochimaru. Before he leaves Sakura attempts to stop him at the village exit, expressing her love for him and begging him to stay. She fails at this and changes tact, saying she will go with him, willing to do anything to be with him. Rather than leave her with words of parting, Sasuke gives her a simple "thank you" before knocking her out In Part II, Sakura begins to learn of the various hardships in Naruto's life, particularly that he is the container of the Nine-Tailed Demon Fox and that Akatsuki seeks to capture him because of it. Furthermore, should Akatsuki succeed in capturing Naruto and remove the demon fox from his body, Naruto will die. Because of these revelations, Sakura has acquired a worrying mentality for Naruto, and cries over the various difficulties he faces. To help him in overcoming these obstacles, Sakura has become very protective of him and does whatever is necessary to keep him safe. Upon finding that the medical abilities she has learned over the timeskip are ineffective in overcoming the demon fox, Sakura tries to see if there are other things she can learn to be of more use to Naruto. As the two spend more time together, she starts to see Naruto more as a very reliable comrade and a trusted friend. As a result of these newfound feelings, Sakura is generally more accepting of Naruto's personality traits and is much more capable of working well with him. She draws the line at his growing perversion, though, although she can be just as perverted at times.
Sansho runs the Curry of Life shop in the River Country with her son Karashi. They specialize in a super-spicy form of curry that can revive anyone with a single spoonful. She first met Rock Lee completely by accident, whilst he was training in the form of an extremely long hike away from Hidden Leaf Village, he himself had passed out but his body had kept on walking. Lee has always been extremely grateful of the Curry of Life for reviving him on that particular occasion and as such is extremely enthusiastic when Team Guy and Naruto are heading towards the mission (and ultimately the shop) in the Raiga story arc. Sansho gives the Curry of Life to the team during the climactic battle against Raiga, but as a bottle of wine is accidentally knocked into the curry, it intoxicates Lee. Neji Hyuga does not seem to receive any benefits from eating the curry, and when he eats it after being wounded, passes out instead of recovering
Sasame is a young kunoichi of the Fuma clan. In search for her older cousin, Arashi, she helped Naruto, Jiraiya, and Sakura find Orochimaru's lair in the Land of the Rice Fields. She almost betrayed them for Kamikiri, Kagero, and Jigumo, but after the trio's defeat, Jiraiya convinced her to become neutral. Later, she saves Naruto from Kagero's (who was disguised as Kabuto) heart connecting technique. When she met Arashi, she saw what had become of her cousin she decided to help Naruto and Sakura in defeating him. After the incident, she decided to join forces with the remaining members of the Fuma clan to rebuild the clan's former glory.
Sasori also known as Sasori of the Red Sand, is a missing-nin from Sunagakure. "Sasori" also means scorpion. After the death of his parents, at the hands of the Hidden Leaf Village's White Fang, Sasori was left in the care of his grandmother, Chiyo, who taught him all she knew about puppetry. After proving adept with the ability, Sasori used his newfound knowledge to make puppets identical to his parents in an attempt to feel loved by them. Because they were only emotionless puppets, this effort failed, and he eventually abandoned Sunagakure twenty years prior to his introduction. Sometime after leaving the village, Sasori joined Akatsuki and was eventually paired with Orochimaru. After Orochimaru left Akatsuki, Sasori was teamed up with Deidara, though he always carried a grudge against his former partner. Sasori would come to form a better working relationship with Deidara, as seen by Deidara's idolizing of Sasori's abilities. Although the two have differing views of art (Deidara preferring works that depart quickly and Sasori favoring long-lasting pieces), Deidara considers Sasori to be his master until the very end, even though Sasori himself never appreciated his ideals
Sasuke Uchiha spent the early years of his childhood living in the shadow of his older brother, Itachi Uchiha, who had proven time and again that he was an extremely talented ninja. Because of Itachi's successes, most of the members of the Uchiha clan looked to Itachi as the clan's future, the biggest proponent of this idea being Sasuke's father, Fugaku Uchiha. Due to this focusing on Itachi, Sasuke did what he could to prove himself to his family, though no amount of training could help him in surpassing the milestones set in place by his brother. Itachi, aware of Sasuke's struggle for recognition, tried to shift some of their father's attention to Sasuke, even offering to train Sasuke in various fields of ninja abilities. Although Itachi succeeded in getting Fugaku to spend more time with Sasuke, much of that time was still dedicated to Itachi, and all the while Itachi never lived up to his promises of training Sasuke. As time went by, Itachi's standing in the clan began to falter as his trustworthiness was constantly called into question. At this time, Itachi also began to create a more competitive relationship with Sasuke, challenging Sasuke to surpass him. Because of Itachi's changing personality, Fugaku began to take a more active interest in Sasuke's development, teaching him the Great Fireball Technique in less time than Itachi had taken to learn it, which also gave Sasuke proper membership into the clan. Most prominently, Fugaku encouraged Sasuke to not follow in Itachi's footsteps, the former prodigy of the clan having lost his father's confidence. Soon after receiving the attention from his father that he had so yearned for, Sasuke returned home late one evening to find all the members of his clan dead. After finding Itachi standing over the bodies of their parents, indicating he was the one responsible for the clans' murders, Itachi informed Sasuke that he wasn't worth killing. As he left, Itachi repeated his encouragement to Sasuke to get strong enough to surpass him, and disappeared into the night. From that day forth, Sasuke lived as an orphan, longing for the parents that had been taken from him and allowing his brother's words to fester. Soon after the clan's annihilation, Sasuke's only goal in life became to gain power through any means necessary in order to kill Itachi and avenge the clan. Sasuke sees little change from his personality and mindset at the end of Part I, still craving power above all else. His lust for strength is such that, during his reunion with Naruto and Sakura, he claims to be willing to give his body to Orochimaru if it means killing Itachi. Sasuke has at least changed to a point that he no longer cares for his former teammates' well-beings, being more than willing to kill them since neither is of any use to him. His relationship with Orochimaru shows a similar lack of loyalty, as during their time together he applies no honorifics to Orochimaru's name, is somewhat rude to him, and does not express his allegiance with Otogakure by wearing a Sound headband. Of the loyalties Sasuke has, the only one he displays is that of the Uchiha clan, the symbol of which he wears on his back collar. Despite this lack of allegiances to those close to him, Sasuke seems to be unable to bring himself to needlessly harm those he has never met before, and makes it a point to prevent their deaths when possible.
The Second Hokage was the younger brother of the First and Tsunade's grand uncle. He greatly contributed to Hidden Leaf Village's establishment as a major power. He was very proud of his superior combat ability, and was especially skillful at water jutsu (to the point that he did not require a source of water to perform them). One such ability was the Water Release: Water Shockwave, which allowed him to spit out a large body of water that he could control to attack others. He was the teacher of the Third Hokage, Homura Mitokado, and Koharu Utatane, and was the one to appoint the Third as his successor. He was resurrected and summoned by Orochimaru to battle the Third, who is eventually forced to seal away his soul to defeat him. One of the anime's filler arcs the Second is revealed to have owned Raijin sword, the blade of which was composed of pure energy and could retract into the handle. Despite being composed of pure energy, the blade can be cracked and broken like a regular sword, which happens at the end of the same filler arc it is introduced in when Naruto uses Rasengan.
Shibi Aburame called "Gen Aburame" in the English Naruto Trading Card Game, is the father of Shino Aburame. During the invasion of Hidden Leaf Village he uses his bugs to draw the poison from his son's body. It is unknown what the gourd on his back is for, but it is assumed that it is for holding more kikaichu insects. The second databook says that he is "a self-possessed figure, the pride of Aburame," suggesting that he may be the leader of the Aburame clan.
Shibuki appears in the second Naruto OVA as the village leader of Takigakure. He is the son of the village's previous leader, who died protecting his village after drinking the hero water. It is because of his father's early demise that Shibuki is a coward. He is first seen cowering behind Sakura, while Team 7 was protecting him, after a bird flies out of nowhere and surprises him. Though he is often cowardly, his entire village loves him and sees him as a hero. The children especially seem to love him. When his village was attacked by his former master upon his return, he was forced to make a terrible choice: either protect the hero's water and let his villagers be killed, or give up the water which the village treasured. Naruto convinces him a hero is willing to sacrifice himself for those they care, like Shibuki's father did. He ends up drinking the hero's water in an attempt to defeat his former master, but is unable to win even with the advantage. The combined efforts of Naruto and Sasuke, however, finish the job. Though the hero's water is usually fatal, Shibuki survives, and becomes a better leader for his people.
Shikaku Nara is the father of Shikamaru Nara. "Shika" means "deer" but "shikaku" can mean "assassin". Like his son, he was part of an Ino-Shika-Cho trio, together with Choza Akimichi and Inoichi Yamanaka. He is married to Yoshino Nara who, as his son says, has him whipped. Despite his claim that "a woman is always tender to the man she loves," his son is never convinced. As a member of the Nara clan, he raises deer, whose antlers can be used to make a medicine which halts the destructive effects of the Akimichi clan's three colored pills. When he is first seen he is portrayed as a bit of an alcoholic, and at times uses some of Shikamaru's catchphrases ("What a drag" in English, "How troublesome" in Japanese). In Part II, Shikaku proves to be much better than Asuma Sarutobi when playing Shogi, as he could easily beat his son at the game while Asuma never could.
Shikamaru Nara is an extremely unenthusiastic person, and as such lives his life avoiding work. This is partly due to seeking paths of least resistance, as he often chooses to do things he would otherwise not do if people nag him enough. His plans on life reflect this aspect of his personality, as he plans to be an average ninja making an average salary, and retire once his children become independent. In his free time he typically takes naps, watches clouds, and plays abstract logic games such as Shogi and Go. When put into a situation where he potentially needs to put effort into something, he attempts to try to find a way to avoid it such as forfeiting a battle or by pretending to be preoccupied with something else. In the instances where he can't avoid these situations, Shikamaru tends to remark "how troublesome". He is fully aware of this side of his personality, and even dubs himself "the number one at running away" or "the number one coward". Despite his cowardly tendencies, Shikamaru is extremely intelligent. Asuma, wondering why Shikamaru was always able to beat him at Shogi and Go despite receiving abysmal grades at the Academy. Asuma then disguised an IQ test as a series of puzzles to see how smart Shikamaru really was. In doing so, Asuma found Shikamaru to have an IQ of over 200, and learned that Shikamaru's poor grades were a result of him finding lifting a pencil to be too troublesome. Nevertheless, Shikamaru works very well with his teammates as their fathers were teamed together in their youth as well. Of his teammates, Shikamaru is closest with Choji, who repays Shikamaru's confidence in him with unyielding loyalty to Shikamaru. Shikamaru also has a strong bond with Asuma, often spending time with him playing strategy games. He even vows to protect Asuma and Kurenai's unborn child for Asuma's sake. One of Shikamaru's more distinctive characteristics is that he finds all women to be bossy and "troublesome". He also often discusses how women ought to act. This viewpoint seems to be largely due to his mother's tyrannical personality, though also seems to be influenced by his father's identical view of women. Contrary to this opinion on women, he has expressed a notably mature interest in marriage and raising a family with one son and one daughter. Ironically, almost all of Shikamaru's opponents have been female. Shikamaru has had a number of his appearances coincide with those of Temari. The two face each other during the final matches of the Chunin Exams. Shikamaru has a chance to claim victory in this match, but he forfeits the match instead, having run low on chakra. Temari later comes to his aid during the Sasuke Retrieval arc and defeats Tayuya of the Sound Four to save him. Shikamaru returns the favor in the last of the anime's filler arcs and saves her from one of the Shiitenshounin. In addition, the two are seen together in their Part II debuts. In this instance, Naruto Uzumaki asks if the two are on a date, though both state that this is not the case. Temari ranks as one of the women he finds most troublesome, along with Ino and his mother.
Shino Aburame is a rarely seen character who has a fascination with bugs; most of his spare time is spent watching bugs, he often makes analogies to bugs when talking, and even the name, "Aburame Shino", bears a close resemblance to the Japanese word for cockroach. In addition to liking bugs, Shino is characterized by his emotionless, solitary, and collected way of doing things. He speaks very bluntly and never allows emotion to interfere with his judgment, sometimes offending people in doing so. Shino seems to be aware of these odd personality traits and even seems to be proud of them, as during the anime's filler arcs he threatens Naruto Uzumaki to make sure nobody ever knows that he could tell jokes. These odd traits have caused people to identify Shino as "creepy" or "weird" and tend to dislike being in his company.
Shiromari is a chameleon summon that takes the form of a castle. It was summoned over fifty years prior to Naruto's visit to the castle with Hinata Hyuga and Kiba Inuzuka in the The Cursed Haunted Castle filler arc. As a last resort, the dying lord of the castle summoned Shiromari and had it devour anyone who approached. The lord died before he could release the summoning, and thus it remained bound to the contract scroll used to summon it. From then on, it devoured anyone who came close. During a mission to find a group of missing people, Hinata, Kiba, and Naruto stumble upon this summon. After being swallowed by it, they realize just what it is. While attempting to find the contract scroll that is keeping it summoned, the spirit of the castle lord appeared and led them to it, because the lord felt sorry for the creature spending fifty years guarding his castle, and wanted to set it free. The summoned creature is very loyal to his summoner, having protected his summoner's castle for so long. Naruto cut the scroll into pieces to send the summoned creature back, and escaped from the body of the summon with Rasengan. The anime does not show Shiromari's true form, but instead, a picture.
Shisui Uchiha was feared as "Shisui of the Body Flicker" and was one of the most talented of the Uchiha clan. Shisui was the best friend of Itachi Uchiha; in fact, Itachi thought of him as an older brother. He was found drowned in a river from what appeared to be suicide, though the Hidden Leaf Village Military Police believed it to be murder. It was later revealed that Shisui had been ordered to keep tabs on Itachi. Itachi later admitted to Sasuke Uchiha that he had murdered Shisui to obtain the Mangekyo Sharingan, forging Shisui's handwriting on his suicide note with the help of the Sharingan. The name 'Shisui' means 'dead water', a reference to his drowning.
Shizune is the assistant of Tsunade and a talented Medic-nin. She left Hidden Leaf Village with Tsunade after her uncle, Dan, died, and trained under Tsunade for many years afterwards. Shizune is quite close to Tsunade, being one of the few people Tsunade will trust with absolute certainty. Unlike Tsunade, Shizune is level-headed, practical, and a rational thinker. As a result, she tends to stress over details like Tsunade's tendency to gamble and think with her heart. She often gets comically worked up over any irrational decision Tsunade makes, particularly her making large bets. Shizune also looks after Tonton, Tsunade's pet pig.
Shukaku the Ichibi was said to be the corrupted spirit of a Sand priest. We now know he is actually one of the tailed demons of the world. Shukaku the one-tail has been in three Sand ninja total. One of his previous hosts inspired Sandaime Kazekage in his usage of iron sand. Shukaku provokes insomnia in his host vessels, should they sleep Shukaku will eat away at their personality. When the host is awake, Shukaku-s powers are limited. If the host builds a new Shukaku body and falls unconscious, the demon can run riot once again. Shukaku is loud and flamboyant in his speech, probably as a result of not being released very often. With his capture by Akatsuki, it is unknown what lies in his future. Shukaku lied dormant within Gaara but could operate freely when Gaara slept. Because of the dangerous nature of Shukaku in this free wheeling state, Gaara went without sleep. As a result his eyes become dark and discolored. Stylistically this enhanced his ties to the tanuki, as the species has a dark area around their eyes. Other features which cause Gaara to resemble a tanuki is the gourd on his back, many depictions of the tanuki feature a gigantic gourd-shaped scrotum which it sometimes slings over its shoulders. Utilizing the sand from his Gourd and the surrounding area, Gaara would cover himself to attain his "perfect" form. To prepare him for this state, Gaara would enter his sand cocoon. When prepared, Gaara would emerge as a small version of Shukaku. This "mini-Shukaku" form allowed Gaara to hurl sand shuriken and use techniques such as Mugen Sajin Daitoppa. The final perfected version is a large scale usage which allows Shukaku himself to emerge and run rampant. Gaara will first gather a gigantic amount of sand into a large-Shukaku form. He will then use the Feigned Sleep technique to fall unconscious an allow Shukaku to control the large sand form. This form was said to have horrified Temari, and been the cause of much destruction in the past.
Suigetsu is a former experimental subject of Orochimaru and the first member to be recruited into Snake and, according to Kisame Hoshigaki, part of the "H�zuki Brothers". He is freed by Sasuke shortly after he defeats Orochimaru. Suigetsu's teeth are shark-like, much like Zabuza Momochi's and Kisame Hoshigaki's. His attire is similar to that of his former master, Zabuza, but it is colored differently. Suigetsu's name means "water moon", a reference to something that can be seen but not grasped, or more specifically how Suigetsu's ability to transform into water escapes him from harm's way, as the moon reflected in water is untouchable. Suigetsu is able to reduce himself to liquid form and to return to bodily form at will. This ability also allows him to change his body shape, giving him the ability to increase the size of his limbs, proportionally increasing his strength, if necessary. It also makes striking him somewhat difficult; since he is made of liquid, any sufficiently powerful strike will go right through his watery form. He is arguably quite powerful or at least very confident in his abilities, since he has threatened Sasuke on more than one occasion. Kisame Hoshigaki even commented on Suigetsu being a prodigy at the art of murder and the next Zabuza Momochi as he commented that Suigetsu had a habit of chopping off his victim's limbs before beheading them. Suigetsu is also the first ninja seen carrying water bottles on his outfit. Given his somewhat frequent desire to consume water, Suigetsu may require regular hydration to sustain his watery form. Suigetsu has Sasuke take him to Zabuza's grave in the Land of Waves after being released, wanting to take possession of the latter's zanbat�. Having trained with the Seven Swordsmen of the Mist, which Zabuza once belonged to, Suigetsu can wield the weapon with relative ease, but traveling longer distances with the sword strapped onto his back tires him out rather quickly. In his allegiance with Sasuke, Suigetsu hopes to acquire the sword of Kisame as well, which Karin assumes to mean that he wants to collect all of the swords of the Seven Swordsmen.
Suzumebachi Kamizuru is the only female and leader of the team made up of herself, Jibachi, and Kurobachi. She claims to be the granddaughter of the First Tsuchikage. She later makes a cameo appearance in episode 161, eating dango with Ibiki Morino. She was able to use the Bee Honey Technique, utilizing summoned bees that engulfed the opponent in sticky honey when killed. "Suzumebachi" can be translated to mean hornet.
Suien was the teacher of Shibuki and a former Jonin of Takigakure (Village Hidden in the Waterfall). He went rogue as a missing-nin and assembled followers in his plan to obtain the chakra-enhancing Hero Water, even if it meant taking hostages in Takigakure. He threatened to kill the captive villagers one by one if Shibuki didn't show himself with the Hero Water. When Shibuki drank the water and hid its bottle in his shirt, he engaged Suien in battle until Suien impaled Shibuki with a water sword technique and discovered the water falling out of his shirt. After Suien drank it, Naruto engaged him in battle long enough for Shibuki to free Sasuke. Naruto and Sasuke then fought him, but Suien was winning until Naruto unleashed the chakra of the Nine-Tailed Fox. After Naruto drew on the Fox's chakra, Suien was no match for him, and thus he tried drinking the last of the water. Before he could do so, Sasuke knocked the bottle of the water out of his hand, breaking it. Naruto then used multiple shadow clones to send Suien flying, causing him to fall down the waterfall, presumably to his death.