Rin Amai

Rin Amai is a character in the Jujutsu Kaisen series. He was a citizen of Sendai City until he was involuntarily turned into a sorcerer by Kenjaku and forced to participate in the Culling Game.

Appearance
Rin is a young man with long light-colored hair that reaches to the back of his neck and thin dark eyebrows. He has large eyes with small black pupils. Rin wears a tracksuit with sneakers and a small hat on the top of his head.

Personality
Rin is an innocent young man compared to other Culling Game players who take advantage of his weakness. He was quick to gravitate toward Yuji Itadori, a familiar face from the same hometown.

Rin first encountered Yuji while standing idle by as another classmate was bullied. He examined the behavior of the bullies and knew how to avoid getting on their bad side. Rin was content going with the flow so others wouldn't see him as a target and took good things as they came. Yuji however stood up for the student being bullied and beat up the bullies. When Yuji turned to see if Rin also wanted to fight, the latter was simply stricken with fear.

During the Culling Game, Rin was too much of a coward to do anything while Hanyu and Haba killed others. After being freed from their grasp by Yuji, Rin helped lead him to Higuruma and even apologized for their previous encounter. He later proved himself by saving Hana Kurusu's life.

History
As a student, Rin regularly hung around a group of bullies at his school. While he secretly looked down on the bullies, seeing them as not smart nor athletic, he avoided getting on their bad side for the sake of not becoming a target of bullying by others as well as receiving "good things" that came his way for associating with them.

Rin first encountered Yuji while standing idly by as another classmate was bullied. He pitied the bullied classmate but refused to help him to avoid angering the bullies. Yuji Itadori then approached them and stood up for the student being bullied. When attacked by the three bullies, Yuji easily defeated them before turning to see if Rin also wanted to fight, terrifying the latter. Rin then fled from Yuji in fear, resulting in him receiving a beating from the bullies who fought Yuji.

Rin would eventually be marked by Kenjaku. He partook in the Culling Game after having his brain adjusted to be able to use his cursed technique by Kenjaku on the night of October 31, 2018. At some point before Megumi Fushiguro and Yuji Itadori entered the Tokyo No. 1 Colony, he was coerced into helping Haba and Hanyu target and kill new players who entered the colony by guiding them with air traffic control lights.

Culling Game Arc
While waiting for new players to enter the Tokyo No. 1 Colony, Hanyu impatiently asked Rin about the lack of new entrants. When Rin responded that he can't do anything about the issue, Hanyu threatened to kill him for talking back to her, leading to him profusely apologizing.

Upon entering the colony, Yuji was transported to a random location in the colony, causing him to appear in the sky above Rin. Using air traffic control lights, Rin guided Hanyu into attacking Yuji. When Hanyu was defeated and Haba confronted Yuji, Rin watcheed from afar and recognized the young sorcerer.

After Yuji defeated Haba, Rin approached him and told him that he knew about Hiromi Higuruma after hearing Yuji mention him. Since Yuji did not recognize him, Rin revealed his nickname "The Tiger of West Junior High" to gain his trust, allowing Yuji to realize that they were from the same hometown. Later on, Rin informed Yuji that Higuruma was in Ikebukuro.

Rin then guided Yuji to a theater that Higuruma used as a base of operations. When Yuji was about to hastily enter, Rin attempted to dissuade him by mentioning that Higuruma once defeated Haba. Yuji remained undeterred and entered the theater anyways, with Rin apologizing to him once he was out of earshot.

When an unconscious Hana Kurusu fell off a skyscraper after Sukuna severely injured her during their fight, Rin stopped her fall using his cursed technique. His actions, coupled with Fumihiko Takaba's cursed technique allowed Hana to survive.

Later, when he was alone with Yuji, Rin divulged to him his insecurities and apologized for not having the courage to join him in his fight against Sukuna and Kenjaku. Yuji thanked him nonetheless for saving Hana, which gave them a chance to win against the two. As Yuji leaves, Rin asked whether he could still fight despite no longer containing Sukuna, to which the latter replied that he would eat anything to kill the King of Curses.

Abilities and Powers
Overall Skill Level: Next to nothing is known about Amai's abilities. He was born a non-sorcerer but was marked at some point by Kenjaku. Using the remote activation of Idle Transfiguration, Kenjaku affected the souls of those marked. This changed Rin's brain to give him the capacity to manifest a cursed technique. Despite gaining the powers of a jujutsu sorcerer, Amai is still weak in comparison to other Culling Game players. He was ordered around and abused by Hanyu and Haba, who could've killed him at any time.

Trivia

 * Rin's surname contains the kanji for "sweet" and "well", and his first name contains "cold".