Hey, if y'all like anime (especially you younger teens and pre teens) you may wanna check out the show: Horuou Musoko (or in English) Wandering Son. It's a great anime about two middle school kids struggling with gender dysphoria. one is MtF and the other is FtM; however the MtF kid is the main focus. The show has some great insights and isn't preachy at all, so I think it could be palatable for a fairly wide audience.
unfortunately, this is the only Transgender anime I've come across. If you guys know any other good ones, I'd love to hear about them.