I head canon Suma Muichiro and Inosuke as half siblings, they all have the same dad but different mom's (obviously because of the bangs😋) Suma is the oldest sibling, she's 19, and her personality, she is overdramatic and exaggerated emotions in practically every situation she's in.She tends to acts immature, arguing with her younger brother Inosuke. But she is a nice girl. Suma is confirmed bisexual Inosuke is the middle sibling. He's 15, and his personality, is short-tempered, confrontational, abrasive and proud. He tends to mess and annoy his older sister Suma all the time Muichiro is the youngest sibling. He's 14, and his personality, he is air-headed individual child who seems to constantly wander off in thought and is unable to focus on anything. His emotionless self watches his older siblings fight with each other but when it's time to get serious he just knocks them on their heads
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