Originally Posted by
Dermie
Yes, Pixie was flirting with Nico Minoru in RUNAWAYS and they almost kissed before Nico remembered she already has a girlfriend and stopped herself. The writer of the issue (Rainbow Rowell) confirmed on Twitter that she was writing Pixie as bisexual.
Apparently an alternate version of Pixie was also LGBT in one of the various tie-ins to Hickman's SECRET WARS. That isn't necessarily relevant to the 616 version, of course--but it was probably where the idea of Pixie being bisexual first popped up.