SV fic where every Cang Qiong peak lord is actually a transmigrator, but such different varieties that Shen Yuan and Airplane are still the only ones who identify one another as such, and they think everyone else is actually the character they represent and everyone else is convinced they're the only transmigrator.
Yue Qingyuan transmigrated into his character's early childhood, but the twist there is that he was a child of a similar age when he transmigrated, and is fully convinced that he had found a magical portal to another world, somehow failed the test of heroism, and is now stuck in a crapsack dystopia that he failed to fix by not being a good enough portal hero. The idea of transmigrators possessing others bodies never occurs to him because he doesn't realize that he himself changed bodies at any point, he just thinks he got a fantasy world makeover that made his hair longer and swapped out his clothes (he was, like, eight years old at the time).
Liu Qingge also transmigrated into his character pretty early on, but in his case he didn't come originally from our world, he came from a wuxia story's world. He was a swordsman and martial artist there, too. He has no notion of any kind of plot or system, he just thinks that he managed to kick enough ass to ascend to the next life and next tier of learning to kick ass, which now involves more flying around and energy blasts and such.
Mu Qingfang is in one of those "doctor from the future goes to an old-timey/magical world and applies advanced knowledge to max out their doctor skills" type stories. He is from our world but from like, the 1920's-ish, and he never read PIDW or any isekai at all. No one ever catches on to him because anything weird he does just seems like Airplane's anachronistic writing or is no more or else inscrutable to the other characters than the rest of his medical knowledge seems to be. He has some suspicions about Shen Qingqiu being a transmigrator like him, but in his own case he gained all of the original Mu Qingfang's memories when he transmigrated so it could also just be amnesia, and he doesn't want to broach the subject if he's wrong. Also he figures it's not necessarily his business, he's just interested because transmigration is a fascinating medical mystery.
Qi Qingqi, on the other hand, had plenty of familiarity with isekai and such as a concept, but she transmigrated as a teenage girl and is pretty sure she's in her own girl's adventure story. But she's desperately trying to avoid any semblance of plot because the girls in those stories always end up married to guys by the end and she's not into dudes. Consequently she's a little worried that some of the troubles embroiling everyone else are a result of her running away to Girl Warrior Peak and not ever meeting like a handsome prince or anything along those lines. It's well after bingqiu becomes a thing that she realizes she's in a danmei instead, and then she's just convinced that she gay'd up the universe (you're welcome) and starts to relax a bit.
And etc, etc, Wei Qingwei and the rest are all living different tropes and angles of a transmigration experience.
