A kink gamer is a person who plays games in a way that satisfies their sexual interests/pleasure by playing a specific character or playing a character with a specific set of skills that is similar in nature to their kink.
I used to know a kink gamer friend who plays like these weird sexual anime games, specifically he likes to play this thicc tan girl who can fart with a lot of power, and like those farts had a lot of damage and toxic stink, and this really disturbed me not because of his sexual attraction, but because those farts made a lot of noise, and the thicc tan girl moaned every time she farted/queef (yes, that thicc tan girl can queef like gamma gas outta her super-powered vagina). Also, the girl's ass expanded very time she farted, and I mean, a lot of expansion, and sometimes her boobs expanded a little bit if the fart was super-powered. My friend has such weird sexual interests, I don't know what's going on in that weird mind of his, but anyways, regardless, he is a huge kink gamer.