Bangs, Bickering, and Bonding: The Sibling Chronicles

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. Lowkey a crybaby haha. She tends to act immature in a childish way arguing and dealing with her younger brother Inosuke. But she is a very nice girl and loves and cares for her little brothers very deeply. 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. He tends to forget things at times. But he is a smart sassy savage boy that is calm. His emotionless self watches his older siblings fight with each other but when it's time to get serious and gets rlly annoyed with them both he just knocks (bonks) them on their heads