Debi

Debi is one of Catherine's high school friends. She makes her first appearance in Muffy Gets Mature, with Tami and Angi. All three are friends of Catherine. Debi makes a cameo in "Muffy Goes Metropolitan" in Crown City, which could mean that she moved to or was visiting the city.

Physical appearance
She has a yellow/orange skin complexion, and she wears a white blouse with a pink shirt over it. She has black hair and a similar hairstyle as D.W.'s. She wears a pink headband in her hair. She was mean to Muffy, saying "Of course that's what you meant!" sarcastically.

Arthur

 * 510b. "Muffy Gets Mature"
 * 702b. "Muffy Goes Metropolitan" (cameo)
 * 1109a. "Big Brother Binky" (cameo)
 * 1802b. "Surprise!"

Specials

 * Arthur, It's Only Rock 'n' Roll (cameo)