Tia is the mamodo partner of pop superstar Megumi. She is very untrusting of other Mamodos because her best friend from the mamodo world tried to kill her once the Battle For King started. She first meets Zatch and starts to trust him at the Megumi concert when he fights Marus, and Zatch teaches her that not all the other mamodos are like Marus.

They then meet again in England when Zatch and Kiyo go to visit Kiyo's dad. Her specialty is defensive spells, so she is not very powerful in battle and often has to retreat. She is very friendly to people she trusts.