He has so many effed up things happen to him; his parents keep doing horrible things to him, coming to their senses, then doing horrible things again…You can’t help but wonder if he winds up being a Serial Killer or something in adulthood (I could totally imagine Butters being like that psycho in ‘Red Dragon’) 
He sure seems like he’ll be a serial killer, except instead of killing animals he keeps getting dressed up as them.
Is it totally wrong or totally intentional that I heard that as if Butters himself were saying it? LMAO over here…
I think he will become a super villain! 
Simpsons did it.
Considering the high value Butters places on obedience, I wouldn’t be surprised if he grew up to be …
NED FLANDERS!!
If you watch some of the very first episodes, before they developed the character, Butters was kind of a bad kid. He didn’t really ever say much but he always looked angry and hung out with those bad kids who kept saying, “That’s gay!”