Time to retcon this Flynn nonsense.

I’m going to make Flynn into Danny’s cousin who got pulled into a natural ghost portal and went missing at a young age. Heck, lets drop the ‘Fenton’ altogether and make him Aunt Alicia’s son. ‘Walker’ is a pretty popular fanon maiden name for Maddie so now we have Flynn Walker. Things are already so much better.
His disappearance caused a rift in Aunt Alicia’s marriage because she knows she saw some supernatural bullshit spirit her son away but her husband doesn’t believe it. Eventually this leads to feelings of resentment building between her and her husband ultimately ending in a bitter divorce. Alicia isolates herself and the only family she keeps contact with is Maddie, who believed her the whole time and did all she and Jack could to help find Flynn.
Unfortunately, poor lil’ Flynn never gets found.
This ties in with the show canon and reinforces why the Fenton parents are so dead set on making sure their kids know ghosts are dangerous, and teaching them how to fight ghosts/defend themselves. It would be perfectly logical in this situation for neither Jazz or Danny to know of Flynn since it’s an old, and sensitive subject.
But what the fuck happened to Flynn??? Hypothetically, anything. Have a ghost adopt him, explore what happens to a human when they die in the ghost zone, have him turn into a feral child, make him a pet, brainwash him into thinking he’s a ghost, make him actually turn into a ghost. The possibilities are endless.
Allow me to present a nerfed version of Human Flynn that grew up in the GZ with “ghost powers”. Imma have this kid surviving on his wits and the absolute fluke of luck that humans happen to have intangibility there. He manages to stay alive, makes alliances, and eventually gets into learning the traditional methods of ghost fighting like using blood blossoms & ectoranium. He uses his human constitution to surround himself with all manner of things that are dangerous to ghosts a la Alchemist Hermit style and simply lives to the best of his abilities.
Perhaps in the first few months or even years of being stranded Flynn had wanted to go home. And he sure as shit tried his hardest to get out of this green hellscape. But now? After so many years on his own, growing, learning and adapting the ghost zone has become more of a home to him than whatever feelings of longing linger in the hazy memories of his childhood.
In conclusion, Fuck Bitch Fartman, Danny has a cousin.
[Edit: Everyone in the Phandom has free reign to use this concept and design to their heart’s content (BUT NOT YOU BUTCH. FUCK U.)]