Two more where it can be confusing: .hack//SIGN and Revolutionary Girl Utena.

Utena rejects "princess" as a gendered role in favor of "prince", but is very clear about still being a girl. Definitely an argument for her being canonically genderqueer, not sure about nonbinary (depending on how much you separate the two).

.hack//SIGN is... somewhat more complicated. One of the main characters basically... exists in the game? And is in a coma or something IRL? They present as male in the game, and learn towards the end of the series (when their body wakes up) that their body was assigned female. The animated series ends before we learn much more than that, but there's a couple of short OVAs that take place after both the series and the first set of video games that offer a bit more insight; the character in question continues to use the same avatar as before they woke up in the game, and presents as male to the point of going into the male side of a hot spring, but proceeds to tell the other characters there that they're actually a girl, so. *big ol' shrug* It's been a while since I watched that one, and I'm pretty sure it wasn't actually officially released in the US, so >_>