Siren (Kamen Rider Wizard)

Siren is the main antagonist of the two episodes called The Son's Keepsake, and A Smile in the Chest.

History
Not much is known about Siren's past history other than that she was born after a woman named Shizune went into despair and she then took over her body with it.

Kamen Rider Wizard
Siren is then sent to make her Gate, Yoshikazu Kumagai desperate. She then uses her human form and goes to the Donut Shop Hungry, she had Kumagai talking to Haruto about a rare toy plane for her deceased son. And when Siren is spotten by Koyomi, she then attacks them, but then she fights Wizard and despite the balanced fight she decides to flee. She later as Shizune she mesmerizes Wajima who reveals that she sold the toy airplane Tamotsu Sakai. And when she gets the toy and tries to destroy it, but the toy plane was saved by Griffon. Wizard and Beast fight her and the Ghouls and she lets the Ghouls take care of Beast and she runs away again. After Siren tells Syo Sakai that his son Tamotsu Sakai to steal the toy plane, and after stealing the toy plane and handing it to Siren, Haruto then saves Syo and prevents Siren from destroying the toy olane using the Bind Ring. Soon after releasing Siren's chains, Shumpe keeps Siren busy until few minutes until Beast appears and sends Siren to retreats, after she fights Wizard, although she managed to master Wizard Flame Dragon, she was dominated by Wizard Infinity Style and destroyed by Giga Dragon Shining.

Trivia

 * Siren just as many Phantoms were based on mythology, it was based on Siren from Greek mythology.