18: Do you prefer to give your ocs specific labels, or keep it unspecified? Why? If applicable, do you change their labels depending on circumstance?
It depends on the character! To some characters it's very important because it is important to the character's story or life. But there are others who simply do not care: Smarty and Funshine in In the Basement, In the Sky are never labeled; and I think the only labels any of the characters in One More Time (With Feeling) is that March is trans masc and asexual, because it matters to his storyline. There are a few other canonically trans characters, but their sexual orientations are never mentioned. None of the characters in And All the Devils Are Here are labeled, although there are f/f and m/m relationships; but you could headcanon them as bisexual or pansexual or whatever!
To some characters it really matters: like Danny being bisexual and Meara being gay in The Black & Blues, because the whole catalyst is them trying to get out of their homophobic hometown. It's very important to me that it's clear that Sara, Austin, and Kris are in an aroace queerplatonic triad, because you see so little of that.
When characters are definitively trans they are identified as trans, and when they are some shade of queer that is identified, too, but I like leaving some things up to interpretation! Like I see Gavin from That Boy, That Girl as aroace but anyone could headcanon him as anything, because he has no romantic relationships simply because he is too busy, so who knows!
Does someone identify with a character with no specification? Do you want to headcanon them as gay or bi or pan or ace or whatever, based on information available in the story? Go for it! Do you think they could be trans? Maybe they could! The only thing I really care about is that nobody tries to untrans or unqueer anyone who is canonically one of those things.
Sorry for the ramble, and thank you so much for the ask!