Regional issues aside...
I don't think it needs to be such a big deal. Loud and proud? Rainbow attacks? Sure, it'd be nice, but just think about it: only one canonically queer champ and they'd be playing into a stereotype. Believe me, as an openly queer person myself I totally want more representation. Yes. But I want it done right. We aren't just some theme to slap on characters. I wouldn't want a champ who's DEFINING TRAIT is their sexuality! Make it canon, make it indisputable, give queer people representation, but make them a well-rounded, realistic, and interesting character when you do it. Personally I think the best way to do it is involve it in their lore, say hey this chick has a wife or this dude has a husband. Because its really no big deal. You can work it in and just treat them like any other character. Maybe if pride themes really needed to be worked in then maybe involve it in their dance, joke, or taunt or something, but even then I don't think its necessary. I don't want there to be just one champ who's canonically queer, and only there for the sake of lgbtqa+ pride. Queer people are normal people too. You can have representation without treating them differently.