Dazai Osamu: adoptive brother?

a ten-year-old child, an orphan who no one wants to adopt because of his temper, he's always angry, but no one knows that he's a bipolar patient, because of his life, because his parents left him behind them, and he had issues from then, even when the orphanage tried to help him, it was so difficult, so they left him like his parents.

he has beautiful red hair and blue eyes, he's too short and thin for his age, his mbti is ESTP, extrovert, sensitive, thinker, player, he doesn't have anyone who loves him like himself, so he gave up trust in people.

A 18-year-old teenager, a student in 3rd year of secondary education, in a high school that requires high intelligence students, he's too smart, always has full marks, and one of the model students in the school, even though he's messy sometimes and playful, but he always has a good reputation.

he's too thin, weighing 60 kg, and he's 178 cm, he doesn't eat much because focusing on his studies, he's mbti is ENTP, extrovert, intuitive, thinker, and player, he's annoying, always play with others' nerves, he has bandages in his thin arms and neck, an orphan that lives alone after he left an orphanage that was a nightmare, but he didn't tell anyone, he has messy brown hair and hazel-brownish eyes with a mole near his right eye, he's depression patient, he doesn't know about his parents.