Here are some noteworthy LGBTQ characters from the Marvel characters.
Jean-Paul Beaubier/Northstar - Marvel’s first openly gay, major character and one of the X-Men.
America Chavez/Miss America - Marvel’s first Lesbian Latina character
Theodore “Teddy”Altman/Hulking and William “Billy” Kaplan/Wiccan –probably Marvel’s most famous gay couple
Raven Darkholme/Mystique and Irene Adler/Destiny - we’ve seen Mystique in quite a few X-men movies, yet it still hasn’t been shown that she is Bi, even though she has a long-term female partner in the comics. :(
Loki/God of Mischief - confirmed to be Bi in the Young Avengers series.
Sera - a trans lesbian angel sorceress
Ken Shiga/Koi Boi - though never stated to be trans in canon, Ken has been shown wearing a chest binder under his clothes and his co-creator, Erica Henderson, confirmed that he is a trans boy.
Raven, Emma, Azazel, Janos or anyone who has spent five seconds around Erik ever:
yes, you love Charles Xavier, I know, you love Charles Xavier so much, he's your precious baby, you love him so much, you just love Charles Xavier, I kNOW, you love Charles Xavier you fucking love Charles Xavier ok I know, I get it, YOU LOVE CHARLES XAVIER. I GET IT.