SO I found an article (https://www.vox.com/culture/21285396/jk-rowling-transphobic-backlash-harry-potter) written by a non-binary identified person arguing that Nymphadora Tonks from HarryPotter was set a NB.

"I vividly remember the visceral excitement I felt the first time I read the fifth Harry Potter book in 2003 and met Nymphadora Tonks, a shapeshifter with spiky pink hair, a punk-rock aesthetic, and an insistence on being called by her gender-neutral last name. I was certain that Rowling had written a canonically genderfluid character. Like millions of other Harry Potter fans who dared to project ourselves into the books, I was ultimately disappointed: By the end of the series, Tonks was a married, fully binary woman, softer and gentler, letting her husband feminize her as “Dora” — a name she’d previously hated. [...] I read this passage as a chilling, heartbreaking confirmation that Rowling wrote Tonks not as an affirmation, even a subconscious one, of trans identity, but as a conscious repudiation of it: She deliberately created Tonks as a dysphoric individual so that the character could “grow out of” her dysphoria, subtly perpetuating the transphobic narrative that gender dysphoria is a choice. She consciously created the shapeshifting nonbinary character who helped me figure out (well into adulthood) that I was genderqueer, and then made her “grow” into being cisgender."

That doesn't make lot of sense to me. Order of The Phoenix was released in 2003. Gender identities at the time weren't exactly a thing. When I read the book back then, I thought Tonks hating her first name didn't mean that she didn't identify as a woman. :/