Siren Deep

 is one of the protagonists and one of the CMY Cures in Rainbow PoP! Pretty Cure! and its sequel, Rainbow PoP! Pretty Cure! Spectrum Sparkle!. Siren is the Student Council Secretary of Colorete Academy. When you look and meet Siren, she is quiet. She is strict. She was smartest. Being she was excellent at all subjects. She was seems as she wants to do her achievements. Siren has simple and good looks, as she looks like a nerd. She can concilling and solving some problems.

Her pretty Cure ego is Cure Cobalt, the color of Wisdom, holds the power of Water.

Personality
Siren is the Student Council Secretary of Colorete Academy. When you look and meet Siren, she is quiet. She is strict. She was smartest. Being she was excellent at all subjects. She was seems as she wants to do her achievements. Siren has simple and good looks, as she looks like a nerd. She can concilling and solving some problems.

Cure Cobalt
Kyua Kobaruto (キュアコバルト) is the pretty Cure form of Siren. She represents the color of Wisdom, holds the power of Water. In order to transform, she needs the ColorPacts and her Prism Keys.

Transformation
Let's Go! Pretty Cure! Rainbow Sparkle! PoP! is Siren's transformation phrase in ''Rainbow PoP! Pretty Cure! and Rainbow PoP! Pretty Cure! Spectrum Sparkle!''.