Evan's mutant power is his ability to shout the phrase "Oh My God" so loud that it can be heard from anybody within a ten mile radius.

Fun fact:  My ex-girlfriend once grabbed Evan's package, thinking that he was me.  I had been crashing at his and Sexx's dorm room, sleeping in a sleeping bag with her, and when she got up to go to the bathroom he and I switched places.  She came back, and the stillness of the night was broken by Evan shouting, "Oh my God she touched my cock!".