Lucy Simian

Miss Simian is Gumball's miserable teacher, who has been teaching second grade for 300,000 years. She utterly despises Gumball and does whatever she can to foil his plans. Principal Brown is hopelessly in love with her, and she appears to return the feeling, as shown in The Mystery, where she says "My poor, sweet Nigel" and she was later ran over by a ambulance.

She likes to give out tests as shown in The End. She also seems to like pretty dresses.

Quotes
Miss Simian: "Like a baby!"
 * "You get an F minus -- in parenting!"
 * "Are you aware that your husband isn't wearing any pants?"
 * "Next! Oh, the Wattersons..."
 * "You're not trying to cheat, are you, Gum-- huh? Who are you?"
 * "...while the rest of us get on with class!"
 * "GET HIM!"
 * "I have a surprise for you, children -- a surprise test! Hahahaha!"
 * Gumball: "How do you sleep at night, Miss Simian?"

Trivia

 * Miss Simian is one of many characters to be created in CGI.
 * She was the only living character who died in the series while Carrie died years earlier.