Cheerleader cat

3rd Grade Female Cat (Number 4) is an unnamed Mighty Mountain student who made her debut in the episode "The Pride of Lakewood". It is assumed that she is a third grader because she takes part in third grade competitions with her cheer squad. She has been seen in a cheerleader uniform as part of the Mighty Mountain's squad at track and soccer games, and only speaks to yell cheers with the other girls. Not much is known about her besides this.

Physical appearance
3rd Grade Female Cat (Number 4) is a cat with a tan complexion. She has only been seen wearing her cheerleader uniform, which consists of a red dress with yellow along the neckline, bottom, and sleeves. There are yellow and black stripes along the waistline, and the letters "MM" (for Mighty Mountain) are displayed in yellow and black across the top. She also wears red tennis shoes with the uniform.

Arthur

 * Season 13
 * The Pride of Lakewood
 * Season 15
 * Nicked by a Name