Ozma comic from Lit Brick.
Ozma, from the “Oz” series, is what could be considered one of the classic “trans” characters. She spends a good deal of her childhood as a boy, transformed by a witch, and is turned back into a girl so she can rule Oz in her “true body”. But Ozma always kept certain elements from her previous form, including what seemed to be strong affection for her lady companions.
I strongly feel that Ozma, along with most of Oz, breaks the rules of heteronormativity. Because it’s a kid’s book, sexuality is never really explored, but gender roles are broken up. And some relationships can be seen as rather romantic bromances/companions. I think it’s natural to see most of Oz as bisexual in the sense that they don’t feel the need to stay in the normal heterosexual relationship unless they want to. Being an immortal means that you don’t have to spend your life doing what society tells you you have to do. Eternity is too long to be unhappy. You spend it with whomever you want to, regardless of your and their gender. Everybody has preferences, but a lot of them seem to be based on personality and interests.
A true utopia has no gender or sexual roles. You stay with whomever makes you happy, kiss whomever you want, and kick Nome king ass.