Game: Ski-Free
What Makes Him Bad: He wants to gobble up your skier, never allowing you to complete the game.
What Makes Him Cool: He's an existential kill screen of a villain who will never let you win. Ever. 

No matter how expertly or nimbly you navigated the courses of Ski Free, in the end, if smacking into a tree didn't kill you, the Yeti would scramble up out of nowhere and gobble your skier whole. And you thought you were actually decent at Ski Free. Nope.