Sasuke Uchiha (ET&BF)

Sasuke Uchiha is one of the main protagonists of Eternal Rivals & Best Friends. is one of the last surviving members of Konohagakure's Uchiha clan. After his older brother, Itachi, slaughtered their clan, Sasuke made it his mission in life to avenge them by killing Itachi, but after meeting his rival and best friend, Naruto Uzumaki, he made it his mission to help Naruto achieve his goals and to always protect him and Sakura.

Background
Sasuke is the second and youngest son of Mikoto and Fugaku Uchiha; they named him after Sasuke Sarutobi in the hopes that he would someday be just as strong of a shinobi. Sasuke grew up in the shadow of his older brother, Itachi, a natural prodigy who many in the Uchiha clan and the village would constantly compare Sasuke and any of his accomplishments to. Sasuke himself adored Itachi, never passing up an opportunity to spend time with him. Although Itachi welcomed his company, letting Sasuke watch him train and taking him on adventures into the forests, Itachi in return rarely helped Sasuke himself become a better shinobi; when asked, he would often instead poke Sasuke's forehead and promise to do so some other time. Sasuke found this annoying, but didn't allow it to blemish his high opinion of his brother.

On entering the Konoha Ninja Academy, Sasuke proved to be the standout of his class, consistently getting top grades. However, he could never meet the same milestones Itachi had set, resulting in their father paying Sasuke little attention. Aware of this neglect, Itachi, despite being increasingly busy, tried to stand in for their father by giving Sasuke the recognition he craved, at times even blackmailing Fugaku to spend time with Sasuke. As time went on, Itachi started becoming distant with and cold towards their family, culminating in a falling out with much of the Uchiha clan on their suspicion that he'd killed his best friend, Shisui Uchiha. Sasuke did not understand the reason for this, but he didn't mind the side-effect: his father began taking an interest in his development. Fugaku taught Sasuke how to perform the Great Fireball Technique, which he mastered in a week. Fugaku stated his pride in Sasuke for this accomplishment, but at the same time encouraged him not to follow in Itachi's footsteps.

After a long day of training, Sasuke returned home one night to find the streets littered with the bodies of the Uchiha. He rushed home to notify his family of this Uchiha Clan Massacre, only to find Itachi standing over the bodies of their parents. Sasuke tried to solicit help and comfort from Itachi, who responded by using Tsukuyomi on him to torment him with visions of him murdering their family. Horrified by what Itachi had done, Sasuke pleaded for an explanation, to which Itachi replied that it was to test his own power. Fearful that he would be next, Sasuke tried to run. Itachi cornered him and explained that Sasuke, as he then was, would not be worth killing. Only by becoming stronger, such as by acquiring his own Mangekyō Sharingan, could he prove a worthwhile challenge to Itachi's abilities. Before leaving, Itachi encouraged Sasuke to hate him, to desire revenge, and to gain power from that. Sasuke immediately followed through, pursuing Itachi and using his newly-awakened Sharingan to attack him. The attack failed and Sasuke passed out, but not before glimpsing Itachi crying; Sasuke would forget this had happened for many years.

Sasuke, now one of the last surviving Uchiha, was alone. He spent the first few days after the massacre wandering his family's compound, reflecting on the people who were now gone, killed by Itachi. Sasuke decided to do what Itachi had instructed and dedicated his life to vengeance, having no other interest than bringing about Itachi's death until he met Naruto Uzumaki.

Personality
Sasuke was a happy child, eager to please and be worthy of his clan name. One of Sasuke's most significant bonds is the one he has with his older brother, Itachi, who by merely being mentioned can elicit strong reactions from Sasuke's otherwise calm demeanour. Sasuke adored Itachi when he was a boy, enjoying his company above all others'; as an infant, he would cry whenever he was held by someone besides Itachi and would immediately be happy once held by his big brother again. When Itachi murdered the rest of the Uchiha clan, Sasuke was crushed not only by the loss of his family but also by what Itachi told him: that he had never loved Sasuke.

He often became depressed and would often think about killing himself. After he met Naruto, he had become more happier and more friendlier (to only Naruto and Sakura).

Appearance
According to Hashirama Senju, Sasuke bears a strong resemblance to Izuna Uchiha: he has black eyes and spiky black hair with a blue tint. Sasuke's hair is long and has hung over his face as bangs since he was a child, which as he gets older he allows to grow longer and, in turn, cover more of his face. After acquiring his Rinnegan, Sasuke grew his hair to cover the left side of his face, notably the eye. He is considered handsome by most girls near his age.

Sasuke's typical clothing has changed a number of times throughout his life, but the Uchiha clan's crest is usually present somewhere on his clothing, such as the back of his shirt collar. For his mask in Part I, he wears a navy blue, short-sleeved shirt with a high collar, white shorts, and, for a time, white arm warmers.

Abilities
TBA

Prologue - The Start of it All
Sasuke was first seen staring of the Uchiha Clan's private lake, thinking about his brother's actions and motives. He considered living in the lake because of how peaceful it is and dived in. After 5 minutes, he was pulled up from the lake by a boy named Naruto Uzumaki. After a fight broke out between the two, Sasuke was shocked at how Naruto acted around him. He didn't give him pity like the rest of the villagers. This, along with Naruto's easy-going attitude, made Sasuke smile and accepted being Naruto's friend.

A week after meeting Naruto, Sasuke and Naruto saved a girl by the name of Sakura from bullies. He himself helped her up and unintentionally flirted with her, causing Naruto to tease him about being a casanova, to which he vehemently refused. After a day, Sasuke made a new friend in Sakura Haruno.

Naruto Uzumaki
TBA

Sakura Haruno
TBA

Itachi Uchiha
TBA

Kakashi Hatake
TBA

Trivia

 * Sasuke means 'help' or 'assistance'. This may be a reference to his role in helping Naruto realize his potential by acting as a rival and best friend.
 * Sasuke is the second oldest as he was born on July 23 between him, Naruto (born on October 10) and Sakura (born on March 28).

Other Sources

 * 1) https://www.wattpad.com/story/287552428-eternal-rivals-best-friends-naruto