A second-year middle school student who time-traveled from 2027 to 1999. She lives at the Cure-it Detective Agency with the fairy Pochitan and solves cases. She has an intuitive personality and her catchphrase is "Hanamaru!" A sincere girl who cannot ignore someone in trouble. By transforming, she becomes Cure Answer.

A second-year middle school girl belonging to the Cure-it Detective Agency. She has a bright, positive personality and values helping others above all else. Although she has little experience in deduction, she uses her excellent observation skills and persistence to tackle numerous cases with her friends. With a strong conviction to seek the truth, she continues on the path to becoming a master detective.

A mysterious girl who, despite being a Precure, acts as a newcomer for the Phantom Thieves for some reason. She has a non-conformist personality and works at her own pace. While she is a girl of few words, she hides a passionate heart within. She loves ice cream. She transforms into Cure Arcana Shadow! "Enveloping in mystery and secrets." Identity and Background: Born November 1, 1983; 16 years old. Originally active as a genius detective at the Cure-it Detective Agency in London. Reason for being in the Phantom Thieves: She lost her best friend and Precure partner, Cure Éclair, in the past. Driven by guilt and a desire to reclaim their bond, she abandoned her title as a Detective Precure to infiltrate the Phantom Thieves.

A 16-year-old pastry chef working at the Patisserie Chouchou. She appears gentle but has a strong core. She is good at talking to various people and uses her high insight and flashes of inspiration to determine what kind of cake a customer wants. She values her own inspirations and brilliance above all. Her true identity is Cure Éclair, and she was formerly partners with Ruruka Moria. However, when Usonoir tried to steal the giant Makoto Jewel, she shattered it to stop him. She lost her memories in the process and has forgotten her time with Ruruka and the fact that she is Cure Éclair.

A 17-year-old rookie mystery novelist. She won the grand prize in a newcomer competition for mystery novels and treasures the glass pen she received then. Mikuru has been a fan since reading her work and is an avid reader of the "Detective Ellie" series. She has a bright and peaceful personality, but is somewhat childish and lacks composure compared to others her age in this story. She is proactive and sometimes takes erratic actions for the sake of story material. As a mystery writer, she has excellent insight and quick wits. On the other hand, she can be airheaded, such as getting so focused on immediate goals that she misses phone calls, which gives her editor Yoriko Henmi a hard time. Her childhood dream was to be a detective. She is a regular at Patisserie Chouchou and is an acquaintance of Kurea.

The student council president of Makoto Mirai Academy Middle School and the granddaughter of the board chairman. A 15-year-old third-year student. She has a strict personality regarding school rules and regulations. A top-tier student, she possesses the intellect to match her strictness. On the other hand, she has a caring side and shows great vocal acting skills when reading picture books to children.

A self-proclaimed genius professor who supports the protagonists. He is 222 years old. He often stays in human form to hide his fairy identity, but he is caring and beloved by the members of the detective agency.

The leader of the Phantom Thieves. He acts according to the prophecies of the "Book of Mirage," which records the future, aiming to cover the world in lies. To achieve this, he continues to collect Makoto Jewels, which are the crystallized true feelings of people. Possessing overwhelming combat ability and calm judgment, he is the greatest enemy of this work, having cornered the Precure many times. His true identity is a fairy, just like Pochitan and the others.

Nijy: A member of the Phantom Thieves, a gentlemanly but narcissistic man. Agesenne: The sole female member of the Phantom Thieves, a gal-style girl who loves trends. Goemon: A member of the Phantom Thieves, a large man who is full of chivalry and cares for his juniors.

Cure Éclair's companion fairy. A very knowledgeable "Fairy of Knowledge." While Kurea had lost her memories as a Precure, she continued to watch over Kurea as Chouchou. She loves Kurea dearly and has a spoiled personality. Her favorite food is cream puffs.