Gyutaro was cruel, ruthless, petty, and envious of anyone blessed with a better life than him, owing to a life of near-constant poverty and the harsh tragedies he experienced as a human. Gyutaro possessed a genuine, strong love for his younger sister, Daki (former name Ume, code name Warabihime), this familial love was so strong that, even after becoming a demon he still stayed with her. Despite being over a hundred years old, she displayed childish and bratty tendencies

Old friends found again 

Dabi is a stoic, aloof, confident, and focused individual who rarely shows emotion. He is intolerant of most people and can be very derisive.

Strong, determined, bratty

His name is Altair, he is strong, muscular, smart, a gentle giant and respectful to nature and his tribe