 If you liked
Gintama
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 ...then you might like
Akaboshi: Ibun Suikoden
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The author of Akaboshi - Ibun Suikoden (Youichi Amano), is used to be an assistant of Hideaki Sorachi, the author of Gintama. So, it has almost the same style of comedy of Gintama. Both of the main character are dumb but strong. But, Gintama is mostly about the comedy (than action).