Sandwich Lady - You don't even get anything useful! The food heals only, like, 5 HP and if you get the wrong food you get teleported too far away!
Prison Pete - Bad rewards, and it is long and confusing!
Mysterious Old Man - He shows up way too often and he has bad rewards.
Ent - So annoying, especially when you're on another site and you don't know it's there!
Rick Turpentine - He comes too often and his rewards are terrible.
Drunken Dwarf - The items he gives are totally useless, and he gets too annoying!
Niles, Miles, and Giles - The rewards you get for getting the question right are absurd.
Frog Prince/Princess - If you already have the frog costume, then it has no use whatsoever.
Captain Hand - The rewards are terrible, like most of the time it is 20gp!
Molly and the Evil Twin - It normally takes me a VERY LONG TIME to finish it because the suspects keep moving too much!

Gravedigger Guy - After you get all the rewards it's just 500gp

. Also when your burying bones there is like a 30% chance he will come, which is too much!

Oh, and where are the genie and the school random? I know that quite a lot of people would not like them.