One Punch-Man, Helck Recommendations
Both series' main protagonist has unusual fighting prowess as they fight powerful enemies. However in most cases, they are underestimated by their opponents and even spectators from the story. Both series also contain a lot of comedy gags that satires their character.
Both manga follows the funny adventures of an overpowered main character with "I don't have a care in the world" attitude
Helck is pretty much one Punch man in a fantasy setting, both are hilarious comedy action series, and if you enjoy either one, the other one is sure to appeal to you too.