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The man known only as Onomatopoeia is a serial killer whose preferred victims are non-powered superheroes. He earned his name due to imitating any sound he hears.

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Batman Villain(s)
This character, team or organization, is or was primarily an enemy of the Batman, or the Batman Family as a whole. This template will categorize articles that include it into the category "Batman Villains."

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Green Arrow Villain(s)
This character is or was primarily an enemy of Green Arrow, or his supporting cast including Black Canary and Team Arrow. This template will categorize articles that include it into the category "Green Arrow Villains."
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This character is or was primarily an enemy of the Teen Titans, the Titans, or any of the other various Titans incarnations. This template will categorize articles that include it into the "Titans Villains" category.


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