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"Parasite" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin. If you came here from a link, please go back and make the right link for one of the villains listed below.
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A parasite is an organism that survives by feeding on a host, a symbiosis known in nature as parasitism. Due to their symbiotic relationship causing harm to their host, they are often depicted as villains in fictional works.