 If you liked Tengen Toppa Gurren Lagann Movie 1: Gurren-hen |  ...then you might like One Punch Man |
Both anime use common tropes that are present in other works of the same genre as their foundation, in order to expose and make fun of them (OPM uses tropes from the superhero genre, while TTGL uses tropes from the super robot genre). Both shows have a similar type of humor and over the top action scenes. They are self-conscious shows that try to be entertaining and are not meant to be taken seriously. They also create a similar atmosphere and vibe.
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