Mutants

Across the Multiverse, many incarnations of mutants exist. The most recorded ones are similar or presumably similar to the Earth-616 mutants with Homo sapiens evolving into Homo sapiens superior (commonly called Homo superior ), by the activation of an X-Gene in their genome from different sources. Mutants, despite their human origins, have many distinctive traits in regards to biology, physiology and genetics from their evolutionary predecessors. Mutants can have wildly varying biologies depending on the nature of their mutation. Mutation is caused by the X-Gene in the mutants' DNA. Mutations normally manifest themselves during puberty, often as a result of a traumatic event. Some mutants exhibit their mutations at birth, however, while others do not manifest their powers until adulthood. Secondary Mutation is a phenomenon in which an existing mutant gains additional powers, or a change in their appearance due to a second mutation.

Further Reading Marvel Wiki

In Game Members

Abigail Brand (Commander of S.W.O.R.D.)	Angel (All New X-Men)	Apocalypse (Classic)	Archangel (Classic)
Beast (Age of Apocalypse)	Beast (Classic)	Bishop (Classic)	Blob (Modern)
Cable (Nathan Summers)	Colossus (Classic)	Colossus (Phoenix Five)	Cyclops (Classic)
Cyclops (Phoenix Five)	Cyclops (Uncanny X-Men)	Daken (Classic)	Daken (Dark Avengers)
Dazzler (Classic)	Doop (Green One)	Domino (X-Force)	Emma Frost (Astonishing X-Men)
Emma Frost (New X-Men)	Emma Frost (Phoenix Five)	Gambit (Classic)	Gambit (Modern)
Havok (Classic)	Iceman (All New X-Men)	Iceman (Bobby Drake)	Jean Grey (All New X-Men)
Jean Grey (Phoenix)	Jubilee (Uncanny X-Men)	Kate Pryde (Marauders)	Kitty Pryde (Uncanny X-Men)
Legion (David Haller)	Magik (Classic)	Magneto (Age of Apocalypse)	Magneto (Classic)
Magneto (Marvel NOW!)	Mystique (Raven Darkholme)	Negasonic (Modern)	Nightcrawler (Classic)
Northstar (Classic)	Onslaught (Psionic Entity)	Professor X (Classic)	Professor X (Charles Xavier)
Polaris (Lorna Dane)	Psylocke (Classic)	Rogue (Classic)	Sabretooth (Victor Creed)
Storm (Classic)	Storm (Modern)	Storm (Mohawk)	Storm (Ororo Munroe)
Wolfsbane (Rahne Sinclair)	Wolverine (Astonishing X-Men)	Wolverine (Old Man Logan)	Wolverine (Patch)
Wolverine (Samurai Daken)	Wolverine (X-Force)	X-23 (All-New Wolverine)