Shakespeare's Malvolio is definitely one! (10)
I believe the answer is:
spoilsport
(Other definitions for spoilsport that I've seen before include "One who ruins others' enjoyment" , "misery" , "nark" , "Wet blanket" , "Damper" .)
I believe the answer is:
spoilsport
(Other definitions for spoilsport that I've seen before include "One who ruins others' enjoyment" , "misery" , "nark" , "Wet blanket" , "Damper" .)