Rictor

Courtesy of Wikipedia:
Introduced in the late 1980s as a supporting character in X-Factor, Rictor appeared in Marvel comics for ten years under the pens of a number of different writers; much of his character development in this period came from Fabian Nicieza's run on X-Force. The character returned to publication in 2005 with the X-Factor vol.3 and has been written by Peter David continually since then. Responding to fan interest in the gay subtext surrounding the character in Loeb's X-Force run, Rictor's kiss with fellow teammate Shatterstar in the pages of X-Factor vol.3 in 2009 became the first depiction of a same-sex kiss in a mainstream Marvel Comics publication. Since then, Rictor has been written as an out gay man who is fully accepting of his sexual identity, and one of few gay superheroes in the Marvel Universe.