Ok now I keep thinking about genderfluid Hogwarts student who are also house-fluid (changing houses occasionally).
Like their first year, they’re placed in Ravenclaw, and at this point in their life they don’t identify as anything. But they’re belief system stems from their desire to figure out their gender, so they work hard researching and discovering their identity. They become enthralled in the LGBTQ+ community and want to learn absolutely everything they can about it all! And finally they find the word that fits: Genderfluid.
So then their second year, they switch to Gryffindor, because they muster up the courage to be themselves. They come out to people and express their changing gender proudly, exhibiting obvious Gryffindor bravery. It’s scary at first, but the courage wells in their chest, and they do all they can to keep their head up as they go along.
And then their third year comes, and most everyone know about their gender. Unfortunately, not everyone is nice. But they do have a good group of friends who stick with them through it all, defending them to the ends of the earth. Of course, the student is so, so appreciative of this loyalty, and they happily return it. This is the greatest thing they believe in right now, which quickly transfers them to Hufflepuff.
Their fourth year comes along, and at this point they are confident in their gender. But they also know there are other students at Hogwarts who are afraid, who are trapped in the closet, some of which don’t even know what to call their identities. That’s unfair, and the student knows it. They become severely passionate about changing things. They tack up posters, start clubs, and sometimes just talk loudly in public about identities so that younger students can hear and learn. This drive to help others, this ambition to save them from struggling, these cunning strategies to do so, place them in the last house, the one they’ve been waiting awhile to visit: Slytherin.