That is literally how Kainé is referred to on the official website for NieR, so yeah, it's not supposed to be a fetish thing but an actual representation of an LGBT+ character. Source: about 3 years ago

“NieR Replicant ver.1.22474487139 (“NieR”)… is an updated version of NieR Replicant, previously only released in Japan. Discover the one-of-a-kind prequel of the critically-acclaimed masterpiece NieR:Automata. Now with a modern upgrade, experience masterfully revived visuals, a fascinating storyline and more. The protagonist is a kind young man living in a remote village. In order to save his sister Yonah, who... Source: about 3 years ago

I don't play shooters, but I do frequently visit some of my favorite streamers who play shooters. One game that I really enjoyed watching was the Bioshock series. The story was really good, and I highly recommend it, given it's 80% off for the entire series on Steam, definitely check it out. Source: over 2 years ago

Although I don't play shooters, I've watched a streamer play the entire Bioshock series in the past and the story was amazing. You play as Jack, the protagonist of the game where he got into a plane crash while flying over the Atlantic Ocean. Being the only survivor, he discovers an underwater city, and then asked to help stop the leader of the city. I definitely recommend for a single player. Source: over 2 years ago