When you reach into the Monster Cup, you want to draw something easy to defeat, like a Maniac or a Cultist or maybe (if you're kitted out correctly) a treasure monster, like a Mi-Go or a Tcho-Tcho . Which the monster do you hate to draw and why?
Colour out of Space is my bogey-man. Immune to all physical and magical weapons, hurrendous Sanity damage and a movement effect that you really don't want hanging around in Arkham.
? Marky-Mark is special ops, going in covert.