I'm going to make this story as angsty as possible. All the main characters are bad people to some degree. They'll make bad decisions.
Some characters may appear out of character. They're not intended to be put of character, this is how I would imagine their personalities develop with consideration of any trauma or past experiences.
Trans characters and gay characters that would realistically not be trans or gay in canon media.
Satirical Kyman. Cartman flirts with Kyle to piss him off.
As with all my poorly written angst there are themes of SI, SH, unrequited love, etc. No happy ending.
Also, use of slurs. Very few if any racial slurs, as I'm a saltine cracker, so mostly queer directed. Derogatory terms towards Jewish people on the regular because Cartman.
Offensive or triggering language will not be censored. I don't really want to. Also it's a south park fanfiction. If you're easily offended or triggered you probably shouldn't be in the fandom in the first place.
This is all the warnings you're getting. I don't want to spoil it to much. There's going to be around 20 chapters.