Raymond Holt (Brooklyn Nine-Nine): Instead of being a classic "gay black man" character, he's a very strict police captain with a desert-dry sense of humor and an occasional flair for drama when he wants to be petty. While his sexuality is sometimes incorporated into some gags or storylines, it's far from his domineering trait. Gustavo Fring (Breaking Bad): I haven't seen Breaking Bad so I can't quite say, but from what I've been told, Gus could basically be a straight guy and the story wouldn't change. I didn't even know there were gay Breaking Bad characters until this post. Undyne the Undying (Undertale/Deltarune): You don't actually realize Undyne is a lesbian unless you go for the more pacifistic option and watch her date Alphys. You could play undertale start to finish and never realize it, but the ship between the royal guard & royal scientist is one of the best in game.
Jesus and Aaron, Game of Thrones. Jesus talks about it a few times but it doesn't really come up again. Aaron initially has a gay partner but he's not a huge character and then he never has a partner again.
Anna from The Expanse in S03.