| "Siren" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin.|
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- Siren (DC) - a mermaid supervillain from DC comics
- Siren (Adventure Quest)
- Siren (Mythology) - a type of sea-spirit from Greek mythology that tempted sailors to their death
- Siren (God Of War) - enemy-type in the God Of War videogames
- Siren (Final Fantasy V) - a boss battle from Final Fantasy V
- Siren (Suite Pretty Cure♪) - ex-villainess from Suite Pretty Cure, otherwise known as Ellen Kurokawa and eventually Cure Beat.
- The Sirens (DuckTales) - One-Shot villainesses from DuckTales episode, "Home Sweet Homer".
- Siren (To The Abandoned Sacred Beasts) - a winged mermaid-like villainess from the manga series To The Abandoned Sacred Beasts