 If you liked
Zetman
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 ...then you might like
Sun-Ken Rock
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very similar art-style, I would say the comedy is similar to something like...bokusatsu tenshi dokuro chan (exaggerated reactions), as well somewhat of a taste of typical harem artstyle i.e. skip beat/ kaicho wa maid sama (where they turn into little cartoon figures). . . Sun-ken Rock takes a lot of art styles from various manga and compiles it into an original plot.
Known for its more mature style and action gimmicks, Zetman and Sun-ken Rock can appeal to an older audience looking for a long term story. Both series follows a protagonist who fights for what they believe in. They also develop relationships and rivalries with many characters to establish their status in the world. Be prepared for a lot of bloodshed and violence as both series adapts some graphic violence into its story.