Queer is an umbrella term for sexual and gender minorities who are not heterosexual and/or not cisgender.
Off the top of my head...
Scarlet Witch is in a presumably sexual relationship with a robot, prior to that she had a very unorthodox relationship with her twin brother.
There is no way Black Widow isn't bisexual. I would probably include Maria Hill too. If the situation called for it in sure Furu and Hawkeye would Honeydick.
[–] ShowMeThePunny ago
Off the top of my head...