Because you like Bulma in Dragon Ball
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.
Experiment 626 was designed for one thing: to destroy everything he touches. See them in Lilo & Stich.
A place as peaceful and enlightened as Piltover has no tolerance for a criminal like Jinx. See them in League of Legends.
Princess Bubblegum is brilliant and determined, but can display a nasty temper. See them in Adventure Time.
Ariel knows there's a whole other world above the sea, but exploring it comes at a big price. See them in The Little Mermaid.
Norma Bates may look like a harmless housewife, but don't let that fool you. See them in Bates Motel.
Mark Zuckerberg has achieved everything he's ever wanted, and he's proving to the world how brilliant he is. But happiness eludes him. See them in The Social Network.
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.
Lady Macbeth takes being a powerful woman to a whole other level. See them in Macbeth.
Wheatley's got an endless supply of bad ideas that he wants to share. See them in Portal Series.