|Mystique by Brian K. Vaughn |
Destiny (Irene) also probably counts, but she tends to be a background character, while Mystique is vey prominent throughout the X-Men storylines.
Most of her male love affairs lacked in emotional depth and were for the purpose of producing children. While she is definitely bisexual, the fact that she can shapeshift into anyone (or anything, apparently), makes her gender identity extremely ambiguous.
Notable points in canon:
- She met Destiny in the 1930s (apparently her shapechanging counters the whole 'mutants die young' thing) and remained in a mostly unseen but committed relationship with her.
- She raised Rogue with Destiny as an adoptive family
- Destiny dies, leading to non-platonic grief and despair (as Destiny died before Mystique was properly 'out', she doesn't appear to have a current female lover).
Notable comic issues:
Unfortunately, Mystique's sexuality remains ambiguous through most of the comics, and never gets much plot time, but there are several issues that refer to her attraction to women, and her loving Destiny.
- The Uncanny X-Men #254: Here We Go Again (1989) Destiny speaks of loving Mystique, and Mystique apparently knows how well Destiny slept
- Marvel Fanfare #40 (1988) - Mystique and Destiny dance romantically in public, Mystique disguised/ shapechanged into a man
- Uncanny X-Men #265: Storm (1990) The Shadow King refers to Destiny as Mystique’s leman (lover)
- X-Men Forever miniseries (2001) - Recap in #5 states that the two are lovers, and that is considered canon from then on
- X-Treme X-Men, Vol. 1: Destiny : X-Treme X-Men #1 - Mystique described as Destiny's true love -
- Mystique by Brian K. Vaughn Ultimate Collection: The Mystique series (2003-5) written by Brian K. Vaughan manage to work in a few hints and undercurrents implying lesbianism, but again, not overt.