GPPC16

The Oath to the Sea! Minami's Most Important Treasure! (海への誓い！みなみの大切な宝物！) is the sixteenth episode of Go! Princess Pretty Cure and is the 551st episode of the Pretty Cure franchise overall.

Major Events

 * Minami's brother, Wataru, appears for the first time.
 * Cure Mermaid receives the Bubble Dress Up Key and uses Bubble Ripple for the first time.

Pretty Cures

 * Haruno Haruka / Cure Flora
 * Kaido Minami / Cure Mermaid
 * Amanogawa Kirara / Cure Twinkle

Mascots

 * Pafu
 * Aroma

Villains

 * Shut
 * Lock
 * Twilight
 * Zetsuborg

Secondary Characters

 * Kaido Wataru
 * Prince Kanata

Trivia

 * This is the first episode where someone stands in the way of a general's target to create the Zetsuborg and that person ends up getting captured instead.