Because you like Vegeta in Dragon Ball Z
Brian Griffin is the most scholarly member of the family—when he's not drunk on martinis. See them in Family Guy.
Eugene H. Krabs is a greedy restaurant owner who won't let a dime out of the reach of his claws. See them in SpongeBob SquarePants.
Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.
It's certainly easier to get great footage of crimes when you can guarantee they'll happen. See them in Nightcrawler.
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Patrick Star enjoys life's simple pleasures because he can't wrap his brain around anything more complicated. See them in SpongeBob SquarePants.
R2-D2 has been in the galaxy saving business for decades. Not bad for somebody whose vocabulary is limited to "beep-boop." See them in Star Wars Series.
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
Barry Allen is a nerd, forensics expert‚ and superhero with supersonic speed who is determined to solve his mother's murder. See them in DC Extended Universe.