Because you like Cosmo Kramer in Seinfeld

A ball of cheerful energy, Pinkie Pie is as sweet as her name suggests and lives to bring others joy with laughter and parties. See them in My Little Pony.

Cheerful, childlike, and easily jealous, fashion icon Misa Amane is smarter and crueler than she seems. See them in Death Note.

How is angel Aziraphale supposed to stop the apocalypse when Hell's forces misplaced the Antichrist somewhere? See them in Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.

The vampire that killed Zero Kiryu's family also infected him, and he starts to crave blood, much to his horror. See them in Vampire Knight.

Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.

Years of brutal winters, foreign invasions, and crippling loneliness have left Russia's mental state far from wholly intact. See them in Axis Powers Hetalia.

China has five thousand years of history, and he's optimistic he'll win over the Allied Powers to the wisdom of his ways. See them in Axis Powers Hetalia.

Ex-adviser to the king and most powerful sorceress, Yennefer is determined to be even stronger to attain her freedom in a war-torn world. See them in The Witcher.

A crabby troll, Karkat Vantas is perpetually angry about his lot in life. See them in Homestuck.

Don't mess with Mickey Milkovich unless you want to see the wrong side of one of his many guns. See them in Shameless.

A brave "Young Wolf," Robb Stark has never lost a battle. See them in Game of Thrones.

A fearless superhero, Carol Danvers always aims to go higher, further, faster. See them in Marvel Cinematic Universe.