Her alter ego, Mona the Vampire has a "vampire sense" which tingles every time there is something foul in the air. Together with her two friends Princess Giant and Zapman, they solve some unlikely mysteries. She dislikes cleaning her bedroom and would rather be battling her arch nemesis, Von Kreepsula. Mona has a cat named Fang, who is her trusted sidekick. She has a talent for breaking spells.
Mona has brown hair with great red hair bowties on top of her head. She wears a black skirt and a red shirt with a white part on it. She also wears white socks and brown shoes with dark brown parts. As a vampire, she wears a purple cape with a black bowtie and yellow and green flowers on it, black hair with five stretched hair parts with red and yellow bowties on them, white fangs, brown knee cover, and purple eye-lashes around her eyes.