1 of 100 Mamono children chosen for the battle to decide the next king.

Human Partner: Megumi Power: Strong Shields and Healing.

Tio is skilled in Defense Magic and has a few offensive and healing spells, but overall, her magic mostly consists of defensive and supporting magic. Tio's power responds toward how her heart feels.

She believed no one could be trusted in the Mamodo tournament after being attacked by a friend of her from the Mamono World. When Kiyomaro and Gash save Megumi and Tio from an attack by the same Mamono, Tio begins to trust others again and allies with Kiyomaro and Gash in order to make sure the Mamono World would be ruled by a kind king.

(Source: Wikipedia, Zatch Bell! Wiki, edited)