Jonathan Teatime

Jonathan Teatime is the main antagonist of Hogfather, the twentieth of Terry Pratchett's Discworld fantasy novel series. He is an assassin for the Ankh-Morpork Assassins' Guild who attempted to kill the Hogfather for good by controlling all human belief.

In the made-for-TV movie, he is played by Marc Warren.

About
Teatime appears to be a pleasant, eccentric young man most of the time. As the story goes on, however, his cheerful exterior is revealed to be just a mask to hide his true self- a sick, sadistic monster who kills indiscriminately and murders anyone helping him as soon as they've outlived their usefulness. If anyone stops helping him, he kills them withou a second thought. Lord Downey let him into the Assassin’s Guild out of pity that his parents died only to suspect that he killed them. If he is sent to kill someone, he will mercilessly slaughter them, their family, and their pets. Even hardened criminals who have earned their reputation on murder are disgusted by his actions, including Downey. The most terrifying thing about him, however, is that he honestly doesn't understand that his sadistic behaviour is wrong. He sees no difference between having a friendly chat with a man and stabbing him to death.