A 16-year-old girl who is a PreCure but belongs to the Phantom Thief Troupe. She has medium-length gray hair and purple eyes. She is Guest's former partner. She stays with Phantom to keep Guest out of the fight and will use any means necessary to ensure Guest doesn't get involved. She wants Guest to remain oblivious to her, the detective work, and the PreCure—an act born out of her genuine love for Guest... She is calm, composed, excels in both academics and athletics, cool, mysterious, and taciturn. She often lets her fairy partner, Mashutan, speak for her. She is also skilled at disguise. She loves ice cream and is almost always eating some; she has a total weakness for it. She used to live in London acting as a master detective, with Guest as her partner. Six months ago, she returned to Japan and started the Japanese branch of the Cure-at Detective Agency with Guest. At that time, when Usonoir almost obtained the Makoto Jewel in its true giant form, Guest transformed for the first time in a self-sacrificing manner, shattering the Makoto Jewel into fragments with overwhelming power. During that event, Guest's Makoto Jewel was stolen by Usonoir. Ruruka resolved herself for Guest's sake, leading to the present. She lies, saying she knows nothing about Cure Éclair, trying to exclude Guest from the battle and hiding the fact that Guest is Éclair.

Cure Arcana Shadow. The PreCure form of Ruruka Moria.

The partner fairy of Cure Arcana Shadow (Ruruka Moria). A 'Fortune-telling Fairy' who can predict anything. She uses a crystal ball and wears a black witch-like hat during readings. Since her prophecies are abstract, even she doesn't know the outcome until it happens. She speaks with feminine mannerisms. Her favorite food is marshmallows. She is always with Ruruka. She is purple, has fox-like ears, and is plushie-sized. Aside from Ruruka, she was the only one who knew Guest was Cure Éclair. She is Ruruka's absolute ally.

A 2nd-year middle school girl. First person: I (polite/feminine). Her catchphrases are 'Gold star!' and 'I never lie.' She lived in Makoto Mirai Town in 2027, but on her 14th birthday, she was guided by the fairy Pochitan and a pendant in her room to time-slip to Makoto Mirai City on April 2, 1999. She has a bright personality but feels a strong sense of loneliness from being in the past. She has orange hair in double buns and emerald eyes. She lives and works as a detective at the Cure-at Detective Agency alongside Mikuru Kobayashi, whom she met in the past version of Makoto Mirai City. She currently attends Makoto Mirai Academy with Mikuru. She is kind. Her favorite food is blueberry tart. Her partner fairy is Pochitan. Rei Kaneda is her senior and friend. She is a fan of Shiruku Ieiri.

A 2nd-year student at Municipal Makoto Mirai Academy. A girl Anna met in 1999 after time-slipping. She was saved by a master detective in the past and aims to become one herself. She has long reddish-brown hair in half-twintails and green eyes. She is clumsy but straightforward. She has extensive knowledge of detective work and is a harder worker than anyone else. She is the type to think things through thoroughly rather than relying on intuition. She loves cute things. She is kind. Her favorite food is mille-feuille. Her partner fairy is Pochitan. Rei Kaneda is her senior and friend. She is a fan of Shiruku Ieiri.

The PreCure form of Anna Akechi.

The PreCure form of Mikuru Kobayashi.

A self-proclaimed 'genius inventor' fairy belonging to the Cure-at Detective Agency. He is embarrassed to be seen in his fairy form, so he usually stays in human form. He claims to be 222 years old, but looks like a young elementary schooler. His job is inventing support items for detective activities. He is a realist, but ultimately kind and caring. He loves all sweets; a mountain of snacks is hidden in the ceiling of his lab. He has blond hair and light blue eyes. In his fairy form, he has cat-like ears, is plushie-sized, and has a yellow body. He is a regular at Patisserie Tutu. He is a fan of Shiruku Ieiri.

The partner fairy of Cure Éclair (Guest). A very knowledgeable 'Knowledge Fairy.' First person: Shushutan. Ends sentences with '-deshu.' She is well-informed and teaches many things. She loves Guest and is very clingy. Her favorite food is cream puffs. While Guest lost their memory, she disguised herself as Guest's scrunchie to watch over them. She has a light blue body, is palm-sized, and has a ribbon on her back. She will not appear until Guest regains their memory.

The PreCure form of Guest.