Because you like Sandy Cheeks in SpongeBob SquarePants
Did he ever tell you the definition of insanity? Just wait, and this psychopath will do just that. See them in Far Cry 3.
A Vietnam vet, Travis Bickle spends his days driving his taxi and watching porn flicks. See them in Taxi Driver.
Not only could Hellboy avenge your death, he'd also have a sense of humor about it and not let it ruin the rest of his night. See them in Hellboy.
Stewie Griffin is just your average evil-genius, talking, sociopathic baby. See them in Family Guy.
If you hang out with Bender in cool dive bars in 31st century New York, make sure you're on his "Do Not Kill" list. See them in Futurama.
Genetically and cybernetically enhanced, Gamora was trained from birth to be one of the deadliest women in the galaxy. See them in Marvel Cinematic Universe.
Mr. Blonde is the undisputed leader of his pack of suited-up outlaws, with a stoic and serious demeanor, and a penchant for bloodshed. See them in Reservoir Dogs.
A secret smoker, Margot Tenenbaum has plenty more secrets where that came from. See them in The Royal Tenenbaums.
While Cassie Ainsworth's head is always in the clouds, her heart is always in the right place. See them in Skins.
Yukiteru is a reclusive observer who would rather watch life go by than participate in it. See them in The Future Diary.