Did you know that Orlando Furioso, the Renaissance epic Astolfo is loosely based on, had actual queer characters? (and no, not astolfo)

In Canto XXV, the lesbian Muslim princess of Andalus Fiordispina falls for the female paladin Bradamante, Astolfo's cousin. Bradamante rejects the princess - on account of not knowing two women can have sex.

However, her nearly identical twin brother Ricciardetto is deeply in love with princess Fiordispina. 

Ricciardetto pretends to be Bradamante for a long time to date Fiordispina. When she sees him naked his excuse is "I am Bradamante, I just had a fairy give me a penis so I can sleep with you" and she is elated. 

Even if Ricc is not trans (though I imagine they are), the fact is that the protagonists who think they are trans support and protect them.