BIG TW: mentions of grooming/icky stuff and whatnot!
To state the obvious, Offenderman. He's just not a well-built character! His whole purpose was to apparently give the creepypasta community something that's "okay to sexualize", but there are better ways to do that than to make a character whose whole deal is that he's a sex offender. His fans are horrible too, because yes, they exist for some reason. We just don't think his creation was a good idea, as he is pointless to the community. He does not serve his original purpose and is instead the designated "punching bag" of the creepypasta community.
Our second least favorite (but not a character we hate) would be Lazari. We don't hate her, we just hate the fact that she's a bit of a Mary Sue, not to mention "cute-bait", and the fact that she ended up getting together with EJ in "I eat pasta for breakfast" despite him babysitting her since she was a little kid. The whole ship is just weird, gross, and groomy.