[Amahain]

From a story perspective, I like partial reverts. One story that's been running around in my head for a while involves a princess being turned into a wolf by angry druids. After a long quest to regain her humanity, she winds up becoming a werewolf (keeping her human mind while in wolf form), which is a slight improvement.

I also like the idea of evil conversion in which the character regains their conscience but keeps their powers and demonic form.

But from a fetishistic perspective, it's the human to animal/demon/monster aspect that I like.