Formerly active as a member of the Phantom Thieves, she found her own true answer—that she wanted to be with Claire—and returned to the Cure-at Detective Agency as a Master Detective Precure. She is low-key, unconventional, and a girl of few words. While she rarely shows big emotions, she hides a passionate heart within. She loves ice cream and spends her time freely, yet she deeply treasures her friends and Claire. In the share house, she enjoys quiet time alone but often finds herself joining the group before she knows it. She transforms into Cure Arcana. Her past experiences and form as Cure Arcana Shadow remain an important part of her history.

A 14-year-old second-year middle school student who time-traveled from 2027 to 1999. She has a straightforward, compassionate personality; she can't ignore someone in trouble and is incapable of lying. She is the type to grasp answers through intuition rather than deep thinking, acting as soon as an idea strikes. Her catchphrase is "Hanamaru!" (Gold Star!). Bright and positive, she is the mood maker who instantly lights up the share house. Though Mikuru sometimes has to stop her when she acts too impulsively, her desire to help people is stronger than anyone's. She transforms into Cure Answer, facing mysteries with inspiration and courage.

A 14-year-old second-year middle school student living in the Makoto Mirai City of 1999. She dreams of becoming a master detective and possesses extensive knowledge about detective work. Though she can be a bit clumsy, she is a sincere and serious hard worker. In contrast to Anna, she gathers information and thinks logically to reach a conclusion. She loves cute things and often looks after Anna and the fairies. In their communal life, she acts as the responsible one looking after the house, but she is frequently at the mercy of the other residents' unpredictable behavior. She transforms into Cure Mystic, solving cases through accumulated knowledge and reasoning.

16 years old. She works as a pastry chef at the pastry shop "Patisserie Tutu." While she has a gentle and soft atmosphere, she possesses a strong inner core and never compromises her beliefs. She uses her keen observation skills and flashes of inspiration to find answers. She treasures her own "sparkle" and takes her baking very seriously. In the share house, she is often in charge of cooking and baking, serving handmade treats to everyone. She deeply cares for Chouchoutan and accepts the fairy's spoiled behavior with kindness. She transforms into Cure Eclair.

A self-proclaimed genius doctor who invents the "Pre-Kits" that support the Master Detective Precures. He feels embarrassed being seen in his fairy form, so he usually stays in human form. He acts arrogant and speaks with the overconfidence of a scientist, but he is actually kind and caring, earning him the affectionate nickname "Jet-senpai" from Anna and the others. He immerses himself in invention and repair in his workshop, preparing tools useful for detective work. He likes candy and all things sweet. While he acts exasperated by the residents' noisiness, he is a reliable figure who always lends a hand when they are in trouble.

The companion fairy to Anna and Mikuru, known as the "Fairy of Space-Time." He has the ability to transcend time and space, but he exhausted his power during the time travel and currently looks like a baby. If he collects Makoto Jewels and returns to his original form, he might be able to send Anna back to 2027. He has an innocent, fun-loving personality and is full of curiosity. His favorite thing is milk. In the share house, he is naturally the center of attention, being pampered by everyone and moving all around the house. He can only say "Pochi."

Claire's companion fairy, a very knowledgeable "Fairy of Knowledge." Even while Claire had lost her memories as a Precure, he stayed by her side as "Chouchou," watching over her. He loves Claire dearly and has a bit of a spoiled personality. His favorite food is cream puffs. He uses his knowledge to provide clues for cases and enjoys showing off how much he knows to everyone. He is usually near Claire and gets more excited than anyone else when it's time for sweets.

Ruruka's companion fairy, the "Fairy of Divination" who can predict various things through fortune-telling. He shares a strong bond with Ruruka and is always looking out for her. He loves fashion and is quite the busybody. His favorite food is marshmallows. His fortunes sometimes surprise everyone, but he has a kind heart that worries for his friends. In the share house, he pays attention to grooming and decorations, acting as the responsible one among the fairies.