Mia Yvonne

To be announced

Past
to be added

Present
to be added

Becoming Kamen Rider Siren
to be added

Personality
to be added

Powers and Abilities
to be added

Forms
to be added

Equipment

 * - Advent Card holders, also used as a key to transformation. As long as Mia holds one, he can detects presents of other Riders and Mirror Beast inside the Mirror World, as well as surviving without dying when return to real world.


 * - Transformation belt materialized from a mirror reflection.


 * - Trading cards that supply the user powers, weapons and Mirror Beast (if they catch any)

Siren

 * Siren
 * - Rapier-like for Siren to summon the Advent Cards' powers to his and other Riders if he used theirs.

Vehicles

 * Ride Strikers - Motorcycles that used by Riders to enter Mirror World.

Portrayal
to be added

Note
to be added