Swamp monster (Saga of the Swamp Beast)

The Swamp Monster was the disguise of Duane, the infamous Gentleman Bandit.

Physical appearance
The swamp monster looked like a giant pile of plant-life, consisting of leaves, sticks, vines, and other plant matter from the swamp. His eyes and mouth glowed yellow.

Personality
The swamp monster was frightening and aggressive, attacking anyone who dared to enter the swamp.

Powers and abilities
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Be Cool, Scooby-Doo!
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Appearances

 * Be Cool, Scooby-Doo!
 * 118. Saga of the Swamp Beast

Notes/trivia

 * He may partially be inspired by famous comic book swamp creatures like Swamp-Thing, or Man-Thing, which also looked like humanoid plant creatures.