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Leon is depicted as being an middle-aged Caucasian male, with short, dark brown hair. He primarily wears a brown suit, with a white shirt and light brown tie.
Leon at first comes across as being a kind and paternal man, who loves his niece, Lisa, dearly. However, he was later revealed to be cold, calculating and selfish, manipulating his own niece to cheat her out of her rightful inheritance.
The Scooby-Doo Show
Leon didn't want Lisa to take over running the hotel, so he tried to get her to think she was a vampire, so she would want to be put away for her own protection.
His scheme had several elements: fake newspaper clippings, faked images of her grandfather as a vampire, six bats from a pet shop on the mainland (sent via a coffin which he opened during the trip from the ferry's dock to the hotel), an ultrasonic whistle to control the bats, and a post-hypnotic suggestion on Lisa that she would put on vampire fangs when she heard the phone ring and her wrist watch alarm go off. He dressed up as Gramps the Vamp as part of the plan. Eventually, Mystery Inc. uncovered Leon's scheme, and he was arrested.
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