List of Johnny Test characters
Wikimedia list article

This is a list of the many characters from the animated television series Johnny Test (including its revival). The main characters are Johnny Test, a fearless 11-year-old boy, and his genetically enhanced dog Dukey, as well as his two sisters Susan and Mary who are inventors.
Main characters
Johnny Test
Johnathan Avalon "Johnny" Test is the titular protagonist of the show, the brother of Susan and Mary and the youngest child of Hugh and Lila. He is a mischievous, egotistical, and unpredictable 11-year-old boy who's often called the "kid with the flaming hair" due to his hair having a flame-like appearance. Johnny can live any kid's dream because of his genius sisters, only to find that some aren't worth living. Despite being generally repulsed by girls, he has nurtured attraction towards his classmates Janet and Sissy, the latter out of hostile rivalry. As a procrastinator, Johnny goes to great lengths to avoid any work, often using his sisters' inventions to do so, putting himself and others in danger as a result. He also has a superhero alter ego that he calls "Johnny X", whose superpowers include hurricane hands (speeding wind from his hands), shapeshifting, fire-powered transformation, teleportation, ESP, and "power poots".
Dukey
Dukeson Leonard "Dukey" Test (voiced by Louis Chirillo in seasons 1–4, Trevor Devall in seasons 5–8) is Johnny's dog and best friend. He often serves as the voice of reason whenever Johnny is on the verge of making a destructive or hasty decision.
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