Terra Formars, Killing Bites Recommendations
Humans turning into bug/animal-like creatures.
Both shows have Animal skills obtained by surgery, brutal fights and a storyteller explaining this abilities during the fight.
But KB has hot girls while Terra Formars has cockroaches
-Both series are focused on humans being able to half transform and use the abilities of other life forms through genetic ingeneering. In Terra Formars it's more varied, having invertebrate, vertebrate, plant, e.t.c based transformations, whilst in Killing Bites it's mainly mammals, and some reptiles.
-Both animes are quite violent and bloody.
-Both offer decent fights involving the powers and characteristic of the animals the character transforms into e.g the strenght of an ant at human scale or the speed of a cheetah.