Because you like Brock in Pokemon

Princess Bubblegum is brilliant and determined, but can display a nasty temper. See them in Adventure Time.

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.

Reckless, vulgar, loud-mouthed: that's what makes Amethyst so awesome. See them in Steven Universe.

Raphael is a short-fused hothead who loves a good fight and some tasty pizza. See them in Teenage Mutant Ninja Turtles.

He's a get rich or die tryin' kind of raccoon. See them in Marvel Cinematic Universe.

Small in stature, Clara Oswald has a big appetite for adventure. See them in Doctor Who.

Donkey is proof that if you're annoying enough you can change the world; he's the reason that his friend Shrek does, well, anything. See them in Shrek.

Morticia Addams hates anything bright and cheery and loves all things ghoulish, ghastly, and violent. See them in The Addams Family.

A believer in the pursuit of justice, Garrus Vakarian hates it when bad guys slip through the cracks of the bureaucratic justice system. See them in Mass Effect.

World domination and Superman's demise are next on Lex Luthor's to-do list. See them in DC Extended Universe.