I think I THINK I'm going with he/she/them with DC
DC becomes much better at telling the main five when he's feeling something different although they do ask
One time, when he was in Washington and having a Bad Time, Florida sent him a Tik Tok that said 'you look non-binary today' and he cried during a meeting
DC feels like he can never come out to the people he works with (minus Gov, IDC, and District of course)
All the main five have cute ways to mix up 'boyfriend' when they need to
Louisiana: Lover
Texas: Partner
California: Girlboyfriend (and then DC sometimes will call him Boygirlfriend)
New York: Soul Mate (he gets weird looks from others about this but he's always like 'The fuck you staring, you heard what I said')
Florida: Accomplice
He does have times where if he falls onto the wrong forum or internet community he questions himself and wonders if he's faking it
Not to mention the discourse already