Dave

Dave (also known as Dr. Octavius ​​Octopus) is the main antagonist of the 2014 animated film The Penguins of Madagascar. He is an abnormally large purple octopus with six tentacles, whose body may develop warts and hairs due to old age.
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The Penguins of Madagascar (2014) - The Story of Octopus Dave - YouTube
Biography
Dave originally lived at the Central Park Zoo in New York City and was a huge hit with visitors, entertaining children with his tricks. However, his enclosure was occupied by baby penguins (young Skipper, Rico, Kowalski, and Ensign), who quickly attracted the public's attention with their cuteness. As a result, Dave was forgotten and moved to another zoo.
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This situation repeated itself many times: at each new zoo or aquarium he was sent to, the penguins received the most attention, not him. Eventually, the octopus was placed in an aquarium that served as a toilet tank, and it was there that his thirst for revenge began to burn.
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Dave later escaped and went into hiding among humans under the guise of Dr. Octavius ​​Octopus—a geneticist, a cheese lover, and a dandruff-fighting fundraiser. During this period, he developed the "Medusa Serum"—a green chemical compound that, when exposed to a ray, transforms animals into physically and mentally deformed monsters. He also built a massive submarine with a secret laboratory base (located in Venice) and recruited an army of octopuses as his henchmen.
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Character
Dave was originally a kind, happy, and friendly animal, but after penguins repeatedly "stolen" his glory, he turned into a vicious, destructive, and manipulative adversary. His dislike for penguins eventually developed into an obsession. He is depicted as cunning, devious, ruthless, and sadistic. However, Dave also has a softer side.