Just to start off this chain of replies, sorry I didn't respond sooner! I had to go out of town Monday night and didn't get back until now.
That's a completely acceptable and super cool character idea as long as they're not super OP. Not trying to assume that you would, just trying to...
So here's my pitch.
Aliens.
Not just plain old aliens though. The characters in this role play will be half human/half alien hybrids.
In the thread, "What Do You Mean Experiments Can Go Wrong" the alien DNA in your character can come from whatever type you desire just so long as there is a...