 If you liked
Hunter x Hunter
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 ...then you might like
One Punch Man
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Like one punch man has a hero association hunter x hunter also has hunter association
They both have main characters who are kinda overpowered - saitama for OPM and killuas family for HxH.
Both have characters who struggle more in fights than others.
Both protagonists are searching for something - a worthy adversary for saitama and his father for Gon.
The only main difference between them is that HxH is a bit darker than OPM.