As you all know, there is a list of lgbtq characters in novels (HERE), but till now I didn’t think it would make sense to make a list of lgbtq characters in movie/tv/visual media. Thanks to a couple of webseries, maybe it does make sense. Feel free to add characters and shows!
Campaign for Camelot (ongoing webseries): Mordred, Izzy (not sure if he is an OC or an arthurian character).
Legend (webseries): Morgana, Merlin (a female character in the show), other OCs.
Monty Python and the Holy Grail / Spamalot: Lancelot, Herbert (OC).