like Shazzbaa, the very first person I try to appeal to is myself and I built everything based on what I like/want to read, I'm a firm believer that if you do something you REALLY love, it can be as weird/niche as possible, it will rub off people, but I don't think that mean my target audience is in the same age range/gender as myself or is really like me.
Maybe my target audience actually IS 'tired lgbt+ ppl who just wants to be protagonists for once/want to see ppl being casually like them without the drama focusing on this aspect of themselves and enjoy a side of demonic stuff with 90s music', but I don't think it means people who don't feel like that can't enjoy the adventure/relate to the characters. Since it's not even advertised as lgbt+ -because it's not the focus- I don't even think I have this many reader who are lgbt+ too.
I think different aspects of one story can bring a pretty big range of different people into the 'target audience', so it's hard to pin point it accurately. Different people reading the same story for different reasons, you know ?