Beelzebub

An Action Comedy Manga with an Anime adaptation that revolves around a Delinquent name Tatsumi Oga and the Demon lord's baby he picked up.

Disclaimer: All characters are 18+ (except for Baby Bel who is clearly a baby)

edit: And also Bel's siblings who are children.

Link to Characters https://beelzebub.fandom.com/wiki/Characters