Because you like Bill Cipher in Gravity Falls

Rupert Giles is a librarian on the outside, fearless evil-fighter on the inside. See them in Buffy the Vampire Slayer.

England may cultivate the image of a well-bred gentleman, but he has both the temper and mouth of a seasoned sailor. See them in Axis Powers Hetalia.

Once described as a "beautiful, tropical fish," Ann Perkins exudes warmth, and unlike most of her friends she also has common sense. See them in Parks and Recreation.

Brilliant, violent, and only a little insane, the Joker doesn't listen to anyone except the voices in his head. See them in DC Extended Universe.

Empathetic Nausicaa embraces all forms of life, even those that might scare other people. See them in Nausicaa of the Valley of the Wind.

High school is Hell, so Allison Reynolds spends her time giving herself tattoos with ballpoint pens and shaking dandruff out of her hair. See them in The Breakfast Club.

David Rose likes his rose chilled, his linens pressed, and his family quiet. See them in Schitt's Creek.

Anyone who's said "Don't worry, it's just a dream" never met Freddy Krueger. See them in A Nightmare on Elm Street.

Samwell Tarly is a scholar, not a fighter. But that's not good for an aspiring member of the Night's Watch. See them in Game of Thrones.

Bojack Horseman is a former sitcom star who loves sharing his opinions with anyone who will listen. Oh, and drinking. A lot! See them in Bojack Horseman.

Killua Zoldyck is so tired of killing. He just wants to be a kid, hanging out and doing stuff with his friends. See them in Hunter x Hunter.

Gregor Samsa is an ordinary man in an abnormal predicament. See them in The Metamorphosis.