at first I just thought he likes to be in transformed state cause of all the perks of the transformation making the body literally healthier and stronger and well it generally makes the body better without any side-effects? but now hmm....
hahahah I have a feeling that the dungeon has no end and he's gonna stay there until his devil side disappears or the one who put him there takes him out cause he's doing more damage to it than changing himself hahahah
so, you mean to say, he was already this powerful when he started and then found a kid and got his foot cut and decided he'll become Villager A cause figures he can't become as strong when he has two feet? and as he stated when he was training he's grown dull? hahahahah unknowingly OP guys hahah...