| Descriptions | Characters |
| Greatly resembles his mother's appearance; Has a human half-brother | |
| Excluding the Muir Island team, this mutant has never been on an actual X-Men team; Coined the term 'genetically challenged' (or 'geecees' for short) to decribe mutants | |
| Uses a fake French accent; Is actually Weapon XIII | |
| Was called Professor W by X-Force; Is best known as a member of Excalibur and one-time lover of Shadowcat | |
| One of the original X-Men; Had his skin turned blue by a villian | |
| Originally from the Age of Apocalypse; Created by Mr. Sinister | |
| Led the X-Men's Gold team during the 90's; Won a dual to become leader of the X-men and later to become leader of the Morlocks | |
| Famously died during his second mission as an X-Man; Debuted in 'Ginated-Sized X-Men #1' | |
| Adopted daughter of Moira MacTaggert; One of the original New Mutants | |
| One of the original members of Generation X; Saved Wolverine from the Reavers in Australia | |