Not much is known about this teacher, as she is not even named and only appears in two brief gags during the entire series. She likes making fun of Denzel Crocker behind his back, and has no problem laughing at him in front of him either.
She has a dark green dress, glasses, brown hair, and she is tall. She speaks with a somewhat nasally voice.
She only appeared in the episode "Transparents!", where she was talking to Principal Waxelplax by the water cooler and telling her a joke about Crocker. While laughing, she and Waxelplax notice that Crocker overheard them, but continue laughing anyway. Later on, Crocker was imagining would happen if he caught a fairy and took over the world. In his imagination, he zapped Principle Waxelplax and the unnamed teacher into smoldering marks on the ground.
The unnamed teacher's last appearance was in "Abra-Catastrophe!", in the scene when Crocker targeted Timmy Turner's Fairy-versarymuffin with a fork-like device, but winds up hitting Principal Waxelplax, whom the unnamed teacher was standing near.