| "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 (mythology) - a type of sea-spirit from Greek mythology that tempted sailors to their death
- Siren (Suite Pretty Cure♪) - ex-villainess from Suite Pretty Cure, otherwise known as Ellen Kurokawa and eventually Cure Beat.
- Siren (To The Abandoned Sacred Beasts) - a winged mermaid-like villainess from the manga series To The Abandoned Sacred Beasts.
- Siren (DC) - super villain from the DC universe.
- Siren Head - a famous internet urban-legend creature created by artist Trevor Henderson.
- Siren Head (2020 Game) - the creature appearing in the 2020 video-game named the same.
- Sirens (Ice Age) - minor fish-like carnivorous animals from Ice Age: Continental Drift.
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