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Sorry if this is an annoying question, but I think I remember you saying that abbadon was a trans-man? (Or trans-masc?) If so, does this ever come up, or is it just a fun fact for the audience to know?
abaddon is a trans man, yes! i believe that miiiiiiight be in his carrd bio, but i don't wanna go look at said bio until i have the energy to do whatever revamping i deem necessary, so i'm not sure at the moment.
specifically, the name for abaddon's identity would be "agender male". some people would describe the experience as being "mostly agender, a little male", but for abaddon it's more like... "male, but not that way". if asked about their own gender, of course, they would just say male — for them, gender is just another social construct they don't really understand or care for, but they do know the impact it has on how people perceive them, and further ostracization would be very detrimental to their goals. they don't even tell people their pronouns, usually; they just don't correct "he" or "they" when they come up xD
i'd say that abaddon's transness doesn't come up suuuuper often in the story, or at least it's not planned to? (besides some drama with cross down the line, that is, and maybe some discussion with killer.) i could see it being mentioned during any sex scenes, not just because "hey i might not have the genitals you're expecting" is an appropriate thing to bring up to someone you want to bang, but because abaddon, being an asexual trans man, has some pretty significant vaginal atrophy that he's absolutely uninterested in getting treated — which of course means that vaginal penetration isn't really possible for him.
...and for reference on that last note, because i don't see people talking about this a lot with transmasc characters: vaginal atrophy isn't something you necessarily need to get treated, provided your personal symptoms don't bother you. (which they probably won't if you don't plan on having sex or masturbating vaginally.) vaginal atrophy just means that your vagina isn't getting "enough" estrogen (something that also happens to post-menopausal people) and therefore kind of shrivels up into "do not disturb" mode, which involves being smaller, dryer, and more easily irritated. of course, everyone's body is unique so the symptoms of vaginal atrophy can be more uncomfortable to some people than others, in which case it's pretty easy to treat with some topical estrogen cream — but since i've seen "atrophic vaginitis" thrown around a bit as a scary buzzword by people who undoubtedly confuse "atrophy" with "necrosis", i thought i'd take a second to clarify.
if you're asking this because you're worried about transphobia against abaddon being a significant plot point, though, don't worry. most of TAU's cast are monsters, and monsters in TAU barely understand what transness is, let alone have a negative opinion on it. the exception to this is probably just X!Gaster, but at this moment i'm not even sure if he'll show up in TAU by any other way than passing mentions xD