Anime in which the good guys and bad guys have different power systems but the MC has the power system of the bad guys. Especially if the MC is terrible at the good guy power system but top tier in the bad guy power system. [What to Watch + Discussion]

Well know examples are "Attack on Titan", Eren being a titan shifter and "Kaiju No. 8", kafka is a kaiju hybrid. Also "Parasyte: the Maxim" in which the main character has a "bad guy" take over their hand, though in this one he Isn't really a part of the "good guy" defense force, he's just a dude, so there isn't really a "good guy" power system. Maybe "Death Note" and "Devilman Crybaby" technically falls under this umbrella but the humans don't really have a power system in those ones from what i recall.

What other anime have this trope?

(reposted because i messed up the title)