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Mummy Daddy is the father of Tanis.
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While seemingly terrifying and vicious, the Mummy Daddy was proven to actually be a friendly and grateful monster, as shown as how he hugged Scooby and Shaggy in gratitude for helping his daughter win the volley ball game and make her feel like a winner. Although a nice person, being a father he was very protective of Tanis, and his friendly mood was replaced with a rather intimidating one as he warned the two to take care of his daughter and her friends, or they would be facing a "very mad mummy".
Powers and abilities
He can make his wrappings reach out and wrap around people.
Scooby-Doo and the Ghoul School
He came to the school to visit and told Shaggy Rogers, Scooby-Doo, and Scrappy-Doo that he wanted to hug them for making his daughter feel like a winner. He is seen sitting on the sidelines during the final celebration dance.