Currently there are 4 letters left (F, O, U, Z) that don’t have a character beginning with that letter.
Just wondering what everyone would like to see if we got someone starting with that letter.
For me it would be:
F: Forge
O: Omega Red or Onslaught
U: Ultron (not the terrible unplayable version) or Uatu
Z: Zemo? Not really sure about this since I can’t think of anyone who’s first name starts with a Z.
Frogue
Omega Red
Ugambit
Zmorph
Fantomex
Omega Red / Osborn, Harry
Ultron-12
Zola, Arnim
Fin Fang Foom or Felicia Hardy
Ororo Munro. Honourable mention to Olivier Batroc 
Umar (Dormammu’s less powerful sister), or Ulysses Bloodstone
Zzxz or Zephyr
I think we need more villains, so with that in mind:
Famine
Omega Red
U… (trying to come up with something more creative than Ultron, but that pool is pretty shallow, it would seem) Union Jack?
Zzzax
Franklin Richards (dual release 3* learning powers and 5* omega level adult)
rOgue (4*)
Ultimate Magneto (5*)
daZZler (4*)
Forbush Man
Old Lace from Runaways
Uatu (The Watcher)
Z… Zombie Hulk?