Yeah, Mutant or Metahuman or whatever, it's all fine. Think of this as our own custom Multiverse, and so your universe can be set up however you want. I'll take a closer look at your character in a bit, but I did see the part about the hider tag. It should look like this without the spaces: 
[ hider = My Hider Title ]
Stuff to be hidden.
[ / hider ]

And when I remove the spaces:

[hider=My Hider Title]
Stuff to be hidden.
[/hider]