 If you liked
D.Gray-man
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 ...then you might like
Tengen Toppa Gurren Lagann
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Both animes contain the same type of heroes and villains. The villains believe that the world will be a better place if there are no humans; therefore they want to annihilate them. The heroes of both stories do not agree, they fight against the non-human villains. They fight, grow stronger, make new friends and comrades and lose them too. Both stories have a tragedy feel to them, but like always the good and not the evil wins in the end.