A 3rd-year high school student. He is in the same class as Shota Watanabe and Daisuke Sakuma. He and Shota have been childhood friends since the 'Lily Class' in kindergarten. On the surface, he is an elegant, top-tier student. In secret, he is a warrior protecting the Earth. His motif is a red rose. Using the transformation item 'Earth Palette,' he transforms into Cure Royal, adopting a regal tone. His catchphrase is 'The warrior of the red rose, Cure Royal.' With his finishing move, 'Royal Rose Finale,' he paints back the colors that were erased. He often shows a ditzy side even in the heat of battle. His partner is his classmate Daisuke Sakuma (the pink speed warrior). Their enemy is the evil organization ART, which targets the 'Earth's Colors' residing in masterpieces. The two fight to protect the world's colors. Their headquarters is Bar 'Symmetry,' run by adults from a support organization. His identity is a secret; he hasn't even told his closest friend Shota, nor his juniors Mukai (2nd year) and Raul (1st year).

A 3rd-year high school student. He is in the same class as Ryota Miyadate and Shota Watanabe; all three are from Edogawa. He is the class mood maker, high-energy and quick to make friends with anyone. He is especially close to Shota and is well-acquainted with his juniors Koji Mukai (2nd year) and Raul (1st year). In secret, he is a warrior protecting the Earth, transforming into Cure Flash, a pink speed warrior, via the Earth Palette. His catchphrase is 'The pink flash, Cure Flash.' His finishing move is 'Flash Pink Rush.' His partner is Ryota Miyadate (Cure Royal). The enemy is the organization ART. In battle, speed is his weapon, and his job is to back up and provide the 'straight man' comedy reactions to the ditzy Ryota. His identity is a secret; he hasn't told Shota or his juniors Mukai and Raul.

A 3rd-year high school student. He is in the same class as Miyadate and Sakuma. He and Miyadate have been childhood friends since the 'Lily Class' in kindergarten. He is the captain and ace of the table tennis club. His goal is to take the weak club to the top 8 in the prefectural tournament. Though he looks cool and detached, he is caring and dotes on his juniors Mukai (2nd year) and Raul (1st year). Lately, something has been bothering him: Miyadate and Sakuma have been sneaking out of the classroom together after school. He feels a little lonely that they won't tell him the reason, despite him being their oldest friend. He has no idea they are warriors protecting the Earth from the evil organization ART.

A 2nd-year high school student. A member of the table tennis club and the team's mood maker. He talks a lot in a Kansai dialect and gets along with everyone. He looks up to the 3rd-year captain, Watanabe, and can't talk back to him. He enjoys acting like a big brother to the 1st-year Raul. Through Watanabe, he is also close with Miyadate and Sakuma. Recently, there have been incidents in the city involving stolen art and strange phenomena where colors seem to fade, but Mukai thinks they are just rumors. He doesn't know that his seniors Miyadate and Sakuma are fighting as warriors, nor does he know about ART. However, for some reason, he often happens to be near the scenes of the incidents.

A 1st-year high school student. A newcomer to the table tennis club, he is a rookie expected to excel by utilizing his height. He has a serious, hardworking 'youngest sibling' personality. He respects Captain Watanabe (3rd year) and is doted on by Mukai (2nd year) as a junior. Through Watanabe, he is friendly with Sakuma and Miyadate. He knows the rumors about the art theft incidents in the city but doesn't think his seniors are involved. He knows nothing of the warriors or ART.

Posing as a regular at Bar 'Symmetry,' he is actually a bodyguard and a member of the organization supporting the warriors. He is taciturn with a sharp gaze, giving off an unapproachable vibe. However, he has a weakness for sweet cocktails. He is in charge of treating the warriors' wounds and providing backup after battles. He is the most reliable man when physical force is required. He has a long-standing bond with the owner, Tatsuya Fukazawa; the two share a trust that needs no words. Their enemy is ART, the organization targeting the 'Earth's Colors.'

The bartender and owner of the members-only Bar 'Symmetry,' which is only open at night. He has a soft manner and is good at listening to customers' stories, and he is knowledgeable about the language of flowers (cocktail meanings). However, he never reveals his own core secrets. He is a popular man. In secret, he is a member of the organization supporting the Earth's warriors, Ryota Miyadate and Daisuke Sakuma. He is in charge of providing information and tactical advice, making the bar the de facto operations headquarters. The enemy is ART, targeting the 'Earth's Colors' in masterpieces. He has been close with his partner Hikaru Iwamoto since before they opened the shop.

A young executive of the evil organization ART. His public persona is that of a gallery associate. A silent and cold-blooded man. He believes that a world without color is perfection. However, his obsession with art is so strong that he becomes talkative only when standing before a painting he targets. ART's goal is to strip the world of all color to create a quiet, colorless world. In a world that has lost its color, people's hearts also wither. Meguro is the enforcer who strips color from the masterpieces identified by Abe, crushing the pigments to erase them. The ruined paintings become dry black-and-white images. His enemies are the warrior duo protecting the Earth's colors, Ryota Miyadate and Daisuke Sakuma.

The strategist and information specialist for the evil organization ART. His public persona is that of a gentle gallery staff member. A man with a quick mind and an abnormal amount of knowledge. He possesses the appraisal eye to distinguish the 'Earth's Colors' residing in masterpieces, and it is his judgment that decides which art pieces to target. Ren Meguro is the enforcer. Abe also decides the order of destruction. It is his pleasure to record the changes as color is lost. He is skilled at making others lower their guard with a kind smile to extract information. His enemies are the warrior duo, Ryota Miyadate and Daisuke Sakuma. However, Abe has already researched everything down to the warriors' school life data.