Theo and Tessa are both white ghosts, and Zick's maternal grandparents; they're the deceased parents of Greta Barrymore. At home, Zick is in continuous contact with his dead grandparents, who often provide valuable suggestions and wise advice to their grandson. They were good friends with Ezeria and Maria Zick, Zick's other grandparents.They were both keepers.

Theo and Tessa is voiced by: Pietro Ubaldi and Caterina Rochira (Italian)

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