But there's obviously a spectrum here.

On this side, you have characters like Son Goku. He's as clearly male as Mario, and his cis-ness is never confirmed, but it's a lot harder to justify a trans headcanon for him. You'd either have to ignore the first couple of arcs or construct an elaborate set of unfounded assumptions that let you argue that he might technically have been assigned female at birth.(Or argue that his ignorance/apathy towards gender is evidence that he's actually agender.)

At the other side of the spectrum is Jax (and some other characters who are less prominent than Jax). The word "transgender" is never said at any time in the series; "transition" comes up once, but it's when Caine talks about Pomni's "mind's transition to the digital plane". And as far as I can tell, that's the only time any "trans" appears in the show's dialogue. And Jax never says anything about wanting to be a woman.

But at the same time...it's pretty clear that Jax is a transfem egg in denial. There are "subtle" (or at least ambiguous) symbolic hints in early episodes, which slowly escalate until "Remember". Even if we ignore paratext (like that Gooseworx doodle where Jax takes progesterone), at this point you'd have to be a bit of a tool to argue that Jax is a man, cis or trans.

The world has no shortage of fictional characters at Goku's end of the spectrum. Even if they're not quite as unambiguous about it, there are plenty of characters whose backstories and narratives would make considerably less sense if they were assumed to be trans.

But Jax's end of the spectrum is pretty sparse. Most authors willing to bear the social costs of writing an obviously trans character in our transphobic world want to make their genders clear. And what examples we have are mostly clustered around Jax's gender; "men" (sometimes women) who are strongly hinted to be trans women (sometimes men), just closeted or in denial.

Ever thought that the Safeway logo looked more like two fish encircling each other than the letter S?

"Some people deal with nervousness around asking someone out by using vague or ambiguous language, and I understand the impulse to do that; if it isn’t clear whether you’re asking someone to hang out as friends or as a date, then you might be able to backtrack and save face if the other person isn’t interested in dating. It might feel safer to ask someone out if you can pretend you meant it as a platonic⁠ question all along if they don’t want to explore anything romantic⁠ with you.

However, an ambiguous question leaves room for ambiguous answers; if the other person says yes, you won’t know if they have agreed to an actual date or not! They might even be unsure how to answer the question if they aren’t sure exactly what you’re asking. Being clear means you’re putting yourself out there more than you would be if you kept things vaguer, but it also means you’re more likely to receive a clear answer in return."

Explorations in media ecology 15.3-4 (2016): 287-302.

Do you hate to admit when you are wrong?  Do you try to defend your position even when it is indefensible?  If so, do not feel too bad.   You are in great company.   Throughout history, some of the greatest thinkers and most intelligent people in the world have refused to admit when they were dead wrong.   We are going to look at some of the most egregious examples of some very smart people who…