X-Men

The X-Men is a team of mutants that resides in New York.

Involvement in Story
At the moment, the X-Men haven't made any major impacts on the story, although they have had an arc of their own involving Apocalypse, when he killed Professor X, causing Wolverine to become the new leader. The X-Mansion was turned into a school for mutant students to learn more about their powers, and possibly join the X-Men.