Total Recommendations: 1
If you liked
One Punch Man
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...then you might like
Shinchou Yuusha: Kono Yuusha ga Ore Tueee Kuse ni Shinchou Sugiru
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Both follow a very similar plot: the hero is OP. There is even a fairly similar villain in the anime, though I do have to say I feel that both are kind of mainstream in terms of how far anime goes. If you enjoyed one of these anime, you'll probably enjoy the other one.