If you liked
Beelzebub
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...then you might like
Kumichou Musume to Sewagakari
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Both series is about a guy who is very strong from the start and then suddenly have to look after a kid. The difference is, one is fantasy that a highschooler is looking after a demon lord's kid and the other is more slice of life from a perpective of a Yakuza family. If you like one then you'll like the other.