mischievous.
* Penelope Victoria "Penny" Sanchez (voiced by Hynden Walch): Rudy's Latina friend, a genius who helps him. She is the only other human besides Rudy who knows about ChalkZone. She and Rudy are implied to have romantic interests on each other, as hinted by Snap and other characters.

Supporting

* Reginald "Reggie" Bullnerd (voiced by Candi Milo): A troublesome school bully and Rudy's rival. His full name

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