Ms. Sunshine

Ms. Sunshine is a substitute teacher that filled in for Mr. Crocker after he was injured.

Background
Although her easy teaching methods and nice behavior are like a breath of fresh air for Timmy Turner and his classmates compared to Mr. Crocker, it turns out that she is actually even crazier and more determined to catch a Fairy than Mr. Crocker was. When all the other students are gone, she transforms into Ms. Doombringer, a "Fairy Hunter" determined to catch and expose Timmy's fairies.

Trivia

 * So far she has only appeared in one episode, No Substitute for Crazy.