I really think the community is WAY jumping the gun on this. It's a single, vague syntax use of they that seems to be gender agnostic as opposed to gender neutral, that is only present in one title, and only in one version of the scripts that Toby oversees. I'm heavily against adding much weight to it in a wiki until we have more sources. I think we all need to pump the brakes just a bit and wait to see what Chapter 6 brings, to get some context. Measure twice, cut once sort of situation.
A wiki should, to the best of its ability, be objective over what is in the game and be able to be consistently backed up with the text, and lean as little into interpretation as possible. If Chapter 6 continues the usage of "their" then I think we might have room to move on this, but as it stands right now it really feels like hyperfocusing on a few very specific scenes that seem in line with Ralsei's current character when taken in context of the rest of the game, and only seem to have weight when removed from that context.
I also don't think we should add gender as a section, I think the pronouns are enough on their own right now. A gender section was added to the other wiki (the Fandom one) and it caused edit wars and vandalism for months. The fact is we don't know anyone's gender in the game really, just their pronouns and how they're perceived. We've been fine for over 8 years without it, adding it now seems like just inviting more infighting in the community.
I'm reminded a bit of the "Noelle is a man" mishap/confusion and while I don't think this is as big as that, waiting for confirmation hurts no one. Jumping the gun with too much bias and interpreation, however, does. There's literally no rush on this. Patience is a virtue.
I would also like to point out the princess scene seems to be taken a bit out of context. Ralsei is explicitly excited to be Kris's Princess. Not just a princess in General. That is a distinction that matters, since it more strongly implies Ralsei is doing things for Kris than for himself (a running theme in the game and this chapter especially)
* Turns out the other princesses they put up here, mostly left...
* But, I can be your princess, Kris! If you want me to be!
(IF YES)
* Really!? Oh, I'm so excited!
* I've been a prince for a while, but I haven't been a princess yet.
* I suppose the only difference is how you present yourself...
* But, it's fun to try new things, isn't it...?
* ... as long as it's... what other people want, of course!
(I can write rather bluntly, so this isn't an attack or a means to shut down an idea, I think you have very good intent, but the section HEAVILY implies that Ralsei's gender is shifting as a confirmed thing, such as it "starts out" with it only being one way. If that is the way it ends up going, GREAT! 100% behind it then, but I think waiting just a bit to see if this is going anywhere with Chapter 6 is just the wiser decision. I know we're all excited to get any scraps of new info, I get it, I'm hyped too, but this genuinely feels interpretive, and not objective, and I'd be against that on any page on this wiki. I do think Ralsei, personally, has some really interesting gender expression and I think it is fun to talk about and explore, but it feels way more in the theory/speculative/subjective reading camp than a wiki section, IMHO).