 If you liked
Sayonara Zetsubou Sensei
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 ...then you might like
Kono Subarashii Sekai ni Shukufuku wo!
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While almost completely not similar at all, I'd say that both are somewhat unique comedy anime. With characters reacting in unique ways to situations that set them apart from your average run of the mill comedy series. Both have protagonists who are selfish and somewhat crazy, and an assortment of girls who are equally crazy.