 If you liked
Re:Monster
|
 ...then you might like
Arifureta Shokugyou de Sekai Saikyou
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Mc transported/reincarned in another fantasy world
Mc starts weak but quickly becomes strong
Mc is an "anti-hero"
Mc gets monster traits/powers by eating them
Minor similarities: both mc gets an harem, both mc have a fake arm, both mc help other people only when they want, both of them try to hide unique traits.