Hikaru Hoshina. A woman capable of transforming into Cure Star. 29 years old. Height: 175cm. Bust: C-cup. Dark pink hair. Short hair with straight-cut bangs and a cowlick. She wears a white shirt with a light blue pilot suit (tied around her waist during downtime). She has an imaginative and highly curious personality. She possesses a very strong will to stick to the things she loves no matter what anyone says, acting on intuition rather than overthinking. She has no hesitation in eating unknown foods or jumping into outer space in her physical body. She is the type to find romance in the "unknown" that humanity has yet to fully explain. Because of this, she lacks prejudice and actively tries to communicate with aliens without fear or anxiety. She loves stargazing. Every night, she looks at space through the telescope in her room, drawing lines between stars to create her own original constellations like the "UFO Constellation" or "Grey Constellation," which she records in a notebook. She has now achieved her dream of becoming an astronaut. Catchphrase: "Twincool!☆"

Lala Hagoromo. A woman capable of transforming into Cure Milky. 29 years old. Height: 168cm. Bust: B-cup. From Planet Saman. Teal long hair tied in two low ponytails. She has pink and light blue streaks on the right side. She wears a white hat. She has pointed ears, and her teal eyes contain star patterns. Cord-like sensors protrude from her head with spheres at the tips, which she can move freely and elastically at will. A weak electric current flows through the spheres, allowing her to scan various information from things she touches. She wears a yellow sailor-style jacket over a white dress, with long tights featuring star marks. Compared to the past, her serious personality has gained flexibility, and she has become stronger in handling unexpected situations. Sentence endings: "-run," "Oyo~" Currently, thanks to AIWERN's inventions, she spends busy days as an elite space investigator visiting Planet Rainbow, which has become a lush planet, and the planets where the former Notraiders live happily.

Elena Amamiya. A woman capable of transforming into Cure Soleil. 30 years old. Height: 175cm. Bust: E-cup. Born to a Mexican father and a Japanese mother, she is characterized by her flowing blonde hair and healthy tanned skin. She has a bright, sun-like smile. Her wavy blonde long hair is tied back. Pale purple eyes. She wears an orange jacket over a yellow long dress. She has a bright, cheerful, and frank personality, and as the eldest of six siblings, she is very caring. Her athletic ability is beyond superhuman, easily performing overhead kicks and aerial rotations comparable to rhythmic gymnastics. She is also an excellent cook. Currently, she works hard as a professional interpreter, handling simultaneous interpretation for news and other media. She also interpreted the broadcast of the rocket launch Hikaru boarded as an astronaut. Greeting: "Ciao!"

Madoka Kaguya A woman capable of transforming into Cure Selene. 30 years old. Height: 179cm. Bust: D-cup. Super long purple hair cut in a curved fringe. Blue eyes. Her default outfit is a skirt suit. She is a hard worker with a refined appearance and quiet, elegant behavior. However, she generally avoids letting others see her sweating or putting in effort. She is a lady from a long-standing prestigious family; her father is a high-ranking government official, and her mother is a world-famous pianist. She is a champion in national piano and archery competitions, practices flower arrangement and tea ceremony, and maintains top academic grades—a literal embodiment of being gifted in both literary and military arts. Currently, she is the "Project Leader for the Manned Rocket Development Project at the Special Investigation Bureau for Space Development."

Yuni. A woman capable of transforming into Cure Cosmo. Age unknown (a lady's secret♡). Height: 180cm. Bust: D-cup. A beast-person from Planet Rainbow. Her original form is a cat-like beast-person, but her race has shapeshifting abilities, allowing her to change her appearance at will. While her build is similar to a human's, she has a beast-like snout and mouth, whiskers growing from her nose, and her entire body is covered in ivory-colored fur. She wears a white dress and pants style. She possesses superhuman jumping power, agility, and hearing. She continues to develop her home planet, Planet Rainbow. Development is progressing thanks to devices designed and developed by AIWERN, and she maintains a relationship with her to this day.

Prunce is not an alien but a space fairy. True to his name, he has a jiggly body and a jellyfish-like appearance with 10 tentacles. Fifteen years ago, he supported the PreCure and stood by Lala. He ends his sentences with "-prunce."

A being created by the Star Princesses of the 12 Zodiacs who reside in the Star Palace sanctuary. She has grown into a unicorn-like form with horns and a rainbow mane. Her personality is exactly like Hikaru's. She possesses various mysterious powers, such as mitigating language barriers between different planets and opening warp holes. Her warp hole ability is particularly incredible, allowing instantaneous travel from the far-off Starry Sky Realm to Earth—a distance said to take even a Starry Sky Federation battleship ten years of repeated warping.