Biography:

Known family: Brian Xavier - father,
Sharon Xavier - mother,
Cassandra Nova - sister,
Cain Marko (Juggernaut) - stepbrother,
Lilandra - ex-wife,
David Haller (Legion) - son
First Appearance: X-Men #1
Aliases: Doctor X, Professor Xaiver, Prisoner M-13, Onslaught II, Consort-Royal, founder, X, Warlord, Entity
Affiliations: Starjammers, X-Men, New Mutants, Shiar Imperium, Brotherhood, Operation: Zero Tolerance, The Twelve, Dark Descendants
Status: Alive