[@WiccanRose15]opposite gender's fine, sense they did that with Wolverine and X23 in cannon anyway.  Any marvel character is fine, as long as they aren't OP and can be cloned (ie: no robots.  Venom could be cloned, though.)
No powers is fine.
Obsure or popular doesnt really matter, as these are clones and not the originals.  If you name their parents, though, they should be obscure/minor though so that people can play the more populat characters if they want.  For example, Tony's mom was a minor xmen character that was mostly just their doctor, and his dad is Hydra bob.

[@EldarionI]Poat it here so that I can look it pver first.