u/Apprehensive-Line-20

So I’ve been writing a story with some friends, and I have a character who can transform into mystical beasts, kind of like how Ben 10 transforms into aliens. My question is: which alien species from Ben 10 could realistically be adapted into the Hunter x Hunter universe?

I think some are definitely possible, like Wildmutt for example, but I’m not too sure about others like Ghostfreak. Maybe some of them could be changed or reworked to fit the world better, but I’m not really sure how to go about it.

I know this isn’t exactly a Hatsu-based question, but I think it would still help with the character and worldbuilding. All thoughts and ideas are welcome.