Trans headcanons!?!?! Yes!
1. This is a headcanon I want to write a story on so give you your opinions in the comments but trans guy Carl. I dont know what it is about Carl but he just gives trans guy vibes. Carl being trans would put an interesting twist on the 'Dom won't give him head' plot line that I think is very cool. Also one of the first time Monica comes back she calls Carl 'Carly', which while that is just Carl's name with the 'e' sound at the end but if Carl was trans he probably would have come out at a young age and I feel like he would pick a name close to what his deadname was, also Monica deadnaming Carl would probably make sense due to her never being there and probably never knowing he was trans in the first place and Frank not deadnaming Carl would also make sense because he can never remember the names of his kid so if one day he got confused trying to figure out Carl name and Carl could probably tell him anything and he'd go along with it. But idk what are yalls opinions?
2. I always loved the idea of t4t Ian and Mickey. Idk why I just do. I can see Mickey being a trans guy, while Ian would either be a trans guy, trans masc and non-binary or just non-binary. Also I think Ian explaining what non-binary is to Mickey would be funny as fuck.
3. I think Franny in the future would be trans masc. She tells Frank she wants to be a boy, also she hate wearing dress. Which that might just be funky little kid shit but idk.
4. Kevin give off trans vibes but he also gives trans protecter vibe. Like if someone miss gendered you, he'd (try to) beat their ass.