 If you liked
Gintama
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 ...then you might like
Star Wars: Visions
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Both SW Visions and Gintama both have samurai (Jedi) mixed with scifi setting of space travel and aliens. SW Visions has more Japanese style settings and characters too than regular SW, which makes it similar in feel to Gintama. Also, Gintama had an arc parodying SW once too.