Fullmetal Alchemist: Brotherhood, Kimetsu no Yaiba Recommendations
Both anime helping his brother or his sister back to human.
Tanjiro helps his sister nezuko to demon back to human and Edward Elric helps his brother Alphonse bring his body back.
Both series have an older brother, who goes to hell and back to save their younger sibling turn back to a human. They also have a strong focus on character and share a similar tone.