Dana Emerald

 is one of the protagonists and one of the RGB Cures in Rainbow PoP! Pretty Cure! and its sequel, Rainbow PoP! Pretty Cure! Spectrum Sparkle!. Dana was a daughter of Policemen. She was a young detective, who can identify if what happens to the city or the victims in La Purisima. She is a weird nerd girl but he has a strong vision and mind. She was being the richest student in Colorete Academy, with her wealthy parents are members of the Police. She also likes books and being the "Philosopher" in the team. She also excellent at Math and Science and discovers any new things.

Her pretty Cure ego is Cure Cerulean, the color of Innocence, holds the power of Poison.

Cure Cerulean
Kyua Serurian (キュアセルリアン) is the pretty Cure form of Dana. She represents the color of Innocence, holds the power of Poison.

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