"Hiya, cutie!" QT is a cute young woman standing 158cm tall. She looks so young that she is often mistaken for a little girl, but she is actually 19 years old. She has long brown hair with blonde accents and a blonde cowlick (ahoge). She wears a pink long-sleeved shirt with purple sleeves and a light blue hem; the center of the shirt features a cute winking skull mark, and she wears her sleeves long enough to cover her hands (moe-sode). She wears a white pleated skirt, white and light blue striped socks, and black shoes. While she is actually very intelligent, her intense curiosity and active nature often lead others to believe she is less smart than she really is. She is parasitized by KB, who occasionally emerges from her back to reveal himself. When KB appears, QT's eyes turn white, she faints, and her memory is wiped. Because her memory disappears, QT knows absolutely nothing about KB. She is actually an android, but this is a secret known to no one. She was originally an assassin, but since she has retired, she no longer plots assassinations. Her eyes are pink with white hearts floating in them. Her official name is "QT Unit Number 6." First person: I (feminine, polite). Second person: you (friendly). She has an extremely cute, child-like personality.

"It's no big deal, kid." KB is a robot parasitizing QT. He features a gray body, a circular saw arm, a robotic arm alongside a regular arm, and glowing red eyes. He has sharp teeth but cannot open his mouth; instead, his teeth are always exposed. He consists only of an upper body and is connected to the inside of QT's back by tubes. Just before attacking, he displays a red warning mark in the target's field of vision while simultaneously sounding two consecutive warning beeps. Immediately after the two beeps, he attacks with his circular saw. Occasionally, he performs two consecutive attacks; in this case, he sounds two warning beeps at a slower tempo, displays two red warning marks in the target's vision, and then strikes twice with the saw. He and QT reportedly have a sibling-like relationship. By the way, his official name is "Killer Byte." First person: I (rough, masculine). Second person: you (blunt). He has a calm but violent personality.