Dr. Poison
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Real Identity: Princess Maru
Appearances: Joker: The Vile and The Villainous!
Powers/Skills: Knowledge of Plagues, Poisons, and Toxins
Voiced By: Not Applicable
Princess Maru disguised herself as a male supervillain in a bulky hooded costume and mask named Dr. Poison, possibly to infiltrate a male dominated business. Nonetheless, one of her infamous creations was Reverso, a drug that made victims do the exact opposite of what they were ordered to do. Eventually, Dr. Poison became a bartender in Gotham City.