Cynthia and Belson have a similar appearance, as they both share a distinct dark-pink nose and curly brown hair. Cynthia has a blue hairband in her hair, and she wears a blue jogging outfit that bares her midriff, and she also wears white and pink shoes.
Cynthia Noles is the affectionate, friendly mother of Belson. She is married to Mr. Noles, who is absent from the series until he appeared in "Company Man". In "Belson's Sleepover", Cynthia explains that Mr. Noles is still around though he "moves around a lot". Cynthia is considered wealthy, with her son, Belson falling into the "spoiled rich kid" personality. She buys him everything that he wants, and in return she is treated poorly. When this is brought up, Cynthia attempts to discipline him, which almost works until Belson gets hurt trying to take out the Christmas stuff from the garage, which happened in "Dust Buddies". Cynthia then reverts back to spoiling him and Belson continues treating her like dirt, secluding himself in his messy room where he plays video games constantly. Cynthia believes that Belson is unable to do anything for himself, so she settles back into catering to his every need (making his food, washing his clothes, etc.) all the while taking care of the other household chores.
Cynthia is a kind, if not neurotic, woman. She seems oblivious to Belson's poor treatment of her, and is happy to indulge in whatever he wants.
- "Zoo" (mentioned only)
- "Lizard Day Afternoon" (first appearance)
- "Belson's Sleepover"
- "Nothing Ventured" (mentioned only)
- "Dust Buddies" (first major role)
- "The Interrogation" (cameo)
- "Company Man" (Pictured Only)
- "Space Race"
- "Plant Daddies"
- "Belson's Backpack"
- "Merry Moochmas"
- "Flood Brothers"
- "Chad and the Marathon"
- "Just Wait in the Car"
- "The Tunnel"
- "Belson Gets a Girlfriend" (final appearance)
- When she's making dinner for the boys in "Belson's Sleepover", her right hand only has 4 fingers.