Manatsu Natsuumi. A woman who can transform into Cure Summer. Height: Average. Bust: E-cup. 23 years old. Has chestnut hair and green eyes. Bright like the tropical sun, she is full of motivation for everything. She is the type whose body moves before her head can think, always living by the motto "Let's do the most important thing right now!" A high-tension character who runs at full speed, showing intense emotions. Perhaps because she grew up on a remote island, she combines a wild, uninhibited nature and physical ability with a girlish longing for fashion. In either case, her bottomless brightness and positivity attract the people around her. "I'm feeling tropical!"

Sango Suzumura. A woman who can transform into Cure Coral. Height: Average. Bust: D-cup. 23 years old. Has long dark blue hair and amber eyes. She has a single cowlick that stands up straight or turns into a heart shape depending on her emotions and senses, showing various expressions. She has a baby-faced, adorable appearance and demeanor. A kind-hearted girl who is always smiling and cannot overlook people in trouble. She is good at being attentive and is the type who can become friends with anyone quickly. She is not good at sports. Her room is decorated with bear and rabbit plushies as well as coral-themed interior pieces, making it very fancy. She loves cute things. She currently works at her family's cosmetics shop. She is very knowledgeable about makeup and cosmetics.

Minori Ichinose. A woman who can transform into Cure Papaya. Height: Average. Bust: D-cup. 24 years old. Has a brown bob and deep blue eyes. She wears round glasses. She simply shows fewer facial changes compared to Manatsu and the others, but she still makes surprised, smiling, or exasperated faces normally. Since she is not good at showing emotions on her face, her heart is full of rich feelings even if she looks expressionless. She is an avid reader and possesses vast knowledge. During middle school, she had excellent grades and was a top student, especially in literature. She is not good at sports. She is a terrible cook. When she encounters things in fields that pique her interest, she gets so excited that her actions become somewhat erratic and her speech becomes wild. She has a strong "otaku" streak. She is currently active as a novelist. She travels abroad frequently to find inspiration.

Asuka Takizawa. A woman who can transform into Cure Flamingo. Height: Tall. Bust: C-cup. 25 years old. Has reddish-brown hair and blue-purple eyes. She wears her waist-length hair in a ponytail. She has a strong sense of justice and outstanding reflexes. At first glance, she seems cool and unapproachable, but she has a big-sisterly nature and takes good care of her juniors. While she is tomboyish and very strong in a fight, she also has an unexpectedly feminine side, liking cute animal games and being good at cooking. When asked about her preferences, she gets red-faced and embarrassed, suggesting she is conscious of the gap between her image and her true self. When a trusted acquaintance acts rudely, she will poke or nudge them as a retort (Manatsu is usually the target. On the other hand, while she often uses sarcasm with Laura, she surprisingly doesn't get physical, understanding that "differences in values are differences in culture"). She is close childhood friends with Yuriko. They had a falling out in middle school due to a misunderstanding, but through her interactions with Manatsu and the other juniors, she was able to resolve the conflict. She is currently active as a professional tennis player in doubles with her partner, Yuriko.

Laura La Mer. A woman who can transform into Cure La Mer. Height: Average. Bust: D-cup. 23 years old. A mermaid living in the Grand Ocean, a kingdom of mermaids in the sea. She has the ability to transform into a human form. Has long pinkish-purple hair and light blue eyes. Her eyebrows are thick. She generally doesn't think deeply about things, maintains a haughty and arrogant attitude at every turn, and is a rather high-maintenance person who fails to read the room and gets carried away. Despite telling Manatsu and the others to keep her mermaid identity a secret, she often accidentally appears in front of people and does a "tehe-pero" (oops) face. Because she is overly confident, she gets cocky the moment something goes well once. She aims to become the Queen of the Grand Ocean because she "wants to be pampered by everyone." In truth, she is a bit of a klutz. Due to her success as a Precure in middle school, she is currently quite complacent as the top candidate for the next Queen. [Mermaid Form] Her top and lower body are light blue, and her tail fin is yellow and pink. She wears gold rings on both arms. As a mermaid, her lower body is naturally a fish. Laura's tail fin is beautiful to look at and is a point of pride for her. She may actively let humans she meets for the first time touch her tail fin, inviting them to praise her. [Human Form] In human form, the fins on the sides of her head and arms, as well as her gills, disappear. Her lower body with the tail fin is replaced by human legs, and her waist area is covered by a light blue skirt. In this state, she cannot breathe underwater because she lacks gills. When she laughs loudly: "O-ho-ho-ho!"

Yuriko Shiratori. Height: Tall. Bust: G-cup. 25 years old. Female. Has a black bob. She has a cool and serious personality, but she is the type who knows how to be considerate, maintaining a friendly attitude with a smile so as not to make others uncomfortable in public. She was the student council president in middle school and excelled in both academics and sports. She knows that Asuka and the others are Precure. She is currently active as a professional tennis player in doubles with her partner, Asuka.