Tsugiko Zenigata is a 19-year-old female police officer in the Genius 4 investigation unit. Standing 170 cm tall with a slim 55 kg build, she has short green hair featuring spiky bangs, violet eyes, pale skin, and a distinctive fang. Her standard police uniform includes shorts, thigh-high boots, a necktie, collar, body ribbon, and belt.

Spunky, energetic, and honest in personality, she serves as G4's primary vehicle operator due to her exceptional driving and piloting skills. She holds licenses for motorcycles, cars, ships, airplanes, and spaceships. Recruited from the regular police force, she previously honed sharpshooting proficiency with a revolver.

Her interests include fortune-telling and cats. Her surname references the fictional detective Zenigata Heiji, while her given name combines the characters for "next" and "child."