Have a question about how the TVTropes wiki works? No one knows this community better than the people in it, so ask away! Ask the Tropers is the page you come to when you have a question burning in your brain and the support pages didn't help.
It's not for everything, though. For a list of all the resources for your questions, click here. You can also go to this Directory thread
for ongoing cleanup projects.
The best option would probably be to go with they/them for the character in general.
We have a forum thread for discussions on character pronouns/identity like this
that you can consult. I think it may greatly depend on the context of the show and how the character is actually represented before necessarily settling on a game plan — to me, I'd hazard that tropes covering both incarnations of the characters can be described with neutral "they/them", but I would just wait and see first.
There is some precedent with this kind of thing with the case of Care Bears, where some characters therough the many incarnations of the franchise got gender flipped. The franchise shares a characters page and handles this by explaining "they were X originally but has been Y since later revivals" in the characters description for that kind of characters. I know it's not the same kind of situation, but I think it's good to keep in mind.
So, a week from today, a new season to one of my favorite shows is coming out, which is a reboot of another show. Press images and especially some leaks that have been getting posted to the Discord server I am part of today hint that a character, identified as male in the original and the first reboot season, might be coming out as trans or at least exploring their gender identity. They could just be gender non-conforming while still using he/him, but in the hypothetical situation of new pronouns, what should be done? This isn't an easy case of the two continuities (it's a continuity reboot) being separate on the wiki - they share the same character page, as most tropes apply to both versions of the character. To highlight the main question here, what should be done for the pronouns on the overlapping tropes? There is a character that was male in the original and female in the reboot, but the tropes don't overlap there - they mostly apply to the original version, so there they are mostly he/him. Even if this is all for nothing with this show and he keeps going by he/him, we should probably think of a game plan for stuff like this for when it does happen.
If you are an admin and want the specific show to actually look at the character page mentioned, DM me. I don't want to spoil things publicly.