Because you like Cookie Monster in Sesame Street

Quinn Fabray can become a monster when there is something she wants. See them in Glee.

There must be quite a lot of fellows who haven't got anybody to bring them tea in the morning. Bertie Wooster is lucky to have his valet, Jeeves. See them in Jeeves and Wooster.

If Jack Torrance is one of his moods, you'll be the unlucky victim of the most bone-chilling, sinister yellers around. Bring your own axe. See them in The Shining.

Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.

Bucky Barnes used to be a good-hearted American soldier. Now he's the cold-hearted Winter Soldier. See them in Marvel Cinematic Universe.

Manipulative, conniving, and ruthless, Mr. Gold is enigmatic no matter what world he's in. See them in Once Upon a Time.

While he might drive colleagues crazy with his antics, Jake Peralta cares about the Nine-Nine more than most things. Including personal hygiene. See them in Brooklyn Nine-Nine.

Andrew Glouberman is trying to make it through puberty with his sanity intact. See them in Big Mouth.

Talking to a stranger on a train is the best decision Jesse Wallace ever made. See them in Before Sunrise.

After having his mind altered after a bad breakup, Joel Barish is not convinced that ignorance is bliss. See them in Eternal Sunshine of the Spotless Mind.

Whether it's a fire or a pit of lions, there's almost no predicament that Violet Baudelaire can't get her and her siblings out of. See them in Lemony Snicket's A Series of Unfortunate Events.

A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.