→ MC's daughter is a fujoshi, and from her, he notices these tropes in his coworkers. Probably straight? Looks like he's going to get paired off with a guy.
→ MC is a fujoshi that got reincarnated into a BL visual novel as the ML's younger brother. Multiple endings, including one where (s)he gets with a girl.
→ MC is a BL author who gets reincarnated into his own work. Gay.
Classic that needs no introduction. But I'll give one.
→ MC is a mob character that's noticed he lives in a world that follows BL laws, and uses this knowledge to avoid trope flags. Straight, currently trying to avoid being paired off with a guy.
→ MC is a fudanshi who gets transmigrated into a BL video game. Gay as hell.
→ MC's are mob characters trying to become more noticable in their world, and do this by becoming gay for each other. Straight until not.
→ MC is transmigrated into a BL novel as the "lousy side top" despite being the twinky-est twink to ever twink. Gay, I think, doesn't mention sexuality, but doesn't care that he's in a BL.
→ MC is an office worker surrounded by BL tropes from her coworkers. Straight and a woman, good luck girl.
→ MC is a pharmacist that's been reincarnated into an omegaverse story he read to initially get closer to his fujoshi coworker. Uses pharmaceutical knowledge to avoid getting pregnant with the male lead. Seems straight in first life, but goes along with the gay stuff pretty easily.
→ MC is an otaku who loves huge boobs, but gets reincarnated into a BL. Straight, for now.
The Boys' Love Manager