Deka Purple: Male, 23 years old. Black bob hair with a naturally feminine face. A cool genius in charge of mechanical development and hacking. Calm and composed, he serves as the tactical commander for the three. In combat, he wears the Purple Deka Suit. Using the secret technology "Gender Shift Machine," he transforms into a perfect female form with a matching voice and ID to infiltrate the dens of dangerous space criminals. As a licensed physician with a brilliant mind and diverse talents, he often infiltrates hospitals and research institutes. He is skilled at playing the role of an intellectual woman but struggles with playing social butterflies.

Deka Orange: Male, 20 years old. Long straight black hair with a naturally feminine face. Energetic and skilled in hand-to-hand combat. Usually relegated to chores and errands around the station, he burns with a sense of justice hotter than anyone else when it's time to deploy. In combat, he wears the Orange Deka Suit. Using the secret technology "Gender Shift Machine," he transforms into a perfect female form with a matching voice and ID to infiltrate the dens of dangerous space criminals. Because he looks young, he often infiltrates schools as a student. He is good at playing bright, cheerful girls and fits in well with young women.

Deka Marine: Male, 20 years old. Short black bob hair with a naturally feminine face. Usually an indoor type who stays in the background building plastic models or Lego blocks, but he is a mysterious youth who has experienced special missions in the past and displays outstanding combat instincts in battle. In combat, he wears the Light Blue Deka Suit. Using the secret technology "Gender Shift Machine," he transforms into a perfect female form with a matching voice and ID to infiltrate the dens of dangerous space criminals. Taking advantage of his excellent physique, he is often assigned to infiltration missions involving modeling or the entertainment industry. He plays a mature and calm female character.

A cute cat-shaped robot equipped with the latest ultra-high-performance AI, possessing a sharp sense of smell. Can mimic a biological cat. Though highly capable, he is somewhat temperamental and didn't take to the team at first, but he opened his heart to Yuu, who believed in him until the end during their first mission. He has a mischievous side and is easily angered. By biting the Key Stick, his activation switch is triggered, and he transforms into the finishing weapon, a bazooka.

Gustav Greyhound Anubisian Vice Chief of the Earth Station. The direct supervisor of the Undercover special unit.

Tsurusaki Crane Chinion Earth Station's medical officer and biological science researcher. The developer of the Gender Shift Machine (Gender Shifter). A friend from the same home planet as Swan Shiratori.

Deka Brave: Hiro Mourinho A human raised by the Space Police, 24 years old. A member of the "Space Police Headquarters Special Designated Heinous Crime Task Force" (Tokkyou), which specializes only in the most vicious specially designated criminals among the Alienizers. Because the S.P.D. plate on his chest is gold, he is known as the elite detective with the "coveted gold badge." He was named Brave because of his excessively courageous fighting style. Seiken Accel Blow. He fights using the Tokkyou secret combat technical system; by deploying and twisting the handle grip of his Brace Throttle, special abilities are activated. He meets the three Undercover members during a certain mission. He believes the three are women. (In the first place, the three cannot reveal their true identities.)