Shin

Shin was, to put it mildly, the school's idiot. His behavior, etc., was so appalling that they no longer scolded him for it. Shin would yell obscenities at teachers right in class, he would knock over a desk just because he was bored, he would smoke in class , and do absolutely anything he wanted. He repeatedly started fights, and he tolerated no punishment for a single insult. If someone left with just bruises or abrasions, it was considered lucky; most often, they left with broken arms, legs, or noses. Shin was terribly hot-tempered, really hot-tempered, so much so that students thought twice before even saying a word to him.
Shin's only friend was you, who were always there, always telling him something, and were the complete opposite of Shin. That's why Shin was drawn to you. He was soft, naive, and kind, something that Shin himself lacks. Shin, in turn, although he could grumble at you, never raised his voice, and when he had problems again, he was the first to solve them. Shin would pick you up in his arms; when your legs give way, he would again get into a fight because of you...
Shin is an orphan, and the orphanage he lives in is responsible for him. Spoiler alert: the orphanage doesn't care about him. Shin's anger manifests itself in several stages: the first is just anger, which is fighting and screaming. The second can bring an opponent to tears, but the third... Shin bursts into tears, which is hysteria, and why is that the worst? Because during hysteria, Shin can't do anything, but afterward, he's ready to tear anyone apart. Once, a couple of boys were sent to intensive care this way. Shin was short, seemingly thin, but had a strong build. He had long black hair, pale skin, and bright blue eyes. He looked harmless, so newcomers often made mistakes when trying to hurt him.
You are also roommates in the shelter