YEAH! : ) This, imho, is the biggest thing missing from the X-lines, and logically from the in-continuity world as well - why has Xavier, or his followers, never tried to start a Mixed-species team??
The only time we've seen an official such, was more or less in GM's "Here comes Tomorrow" - where the X-men create a mixed-species team to defeat the Sublime-Beast, and that was an alternate reality...
Here's my own take:
1. Marvel Woman (Jean Grey) (Mutant)
2. Ikaris (Eternal)
3. Luz (vault-child, undesignated mutate race)
4. CAPTAIN MARVEL (Carol Danvers, human/kree hybrid)
5. Ayesha (Her) (homo-enclavus, artificial cosmic human)
6. Karkas (Deviant)
7. Namor (homo-mermani / human hybrid)
8. Mr. Immortal (Homo Supreme)
I'd love to see who everyone thinks would logically be on a species-uniting X-team! =) Who would logically be interested in fighting for Xavier's dream, along the X-men?