6. Cable
Another character from the X-Men comics who would fit in with the newly introduced time-travel concept in the movie adaptations is Cable (Nathan Summers). The son of Cyclops (Scott Summers) and the aforementioned Jean Grey's Clone, Madelyne Pryor, Cable is an enormously powerful mutant with the powers of technopathy, telekinesis and telepathy. He also has enhanced physical attributes and is a highly skilled marksman. He has appeared in various different eras in the comics. Having initially been born in the present and sent to the future, he returned to the past to stop his villainous brother, Stryfe, from causing havoc. He's a truly mighty character whom I'm very surprised hasn't already been used, or at least confirmed for use, in the movie franchise. He would definitely be a welcome addition to the live action X-Men universe.