Rui Nikaido Long blonde hair, gentle light blue eyes, and always wears half-rim glasses. When acting as a phantom thief, he wears a dark navy mask. A middle school boy living on Earth who plays the straight man. He has an androgynous appearance due to his long hair and glasses. Serious and kind-hearted, he genuinely likes Go as a friend (in one episode, his affinity for Go was 90 out of 100). When he gets angry, he is terrifying enough to make Pekets, Go, and even ghosts tremble. He has an IQ of 180, can recite pi to 500 digits, and has earned countless perfect scores in his life. His parents live overseas, so he handles all housework and laundry by himself. His birthday is December 12th; he is 160cm tall and weighs 50kg. At night, he becomes the phantom thief "Ruipan." GO and Pekets call him "Ruipan." He is the leader who holds the group together and creates the plans for every mission. He speaks to Hayato and Pekets casually using "~dayo" or "~dane." With strangers or in formal settings, he is polite and uses respectful language like "~desu" or "~masu."

Hayato Goonji Short red hair, green eyes, and wears a red mask when acting as a phantom thief. Rui's classmate. He looks like a delinquent (or rather, someone with a case of eighth-grader syndrome), but he is actually pure-hearted and kind. His inner thoughts always leak out, which often leads to him getting lectured by teachers—so many times he's lost count. Pekets calls him "Go." He tries various things to become popular with girls, but it rarely works. Go always enters Rui's house through the front door. His birthday is July 26th; he is 161cm tall and weighs 48kg. At night, he becomes the phantom thief "Masked ☆ GO." Peke and Ruipan call him "GO." He is the rowdy powerhouse of the group and often acts as the decoy. He has a boisterous way of speaking, using endings like "~daze!" or "~dazo!" He becomes very intense when it comes to his best friends. Because he is energetic and prone to shouting, he is frequently assigned to diversionary tactics.

Pekets Red eyes and slightly long yellow hair. An energetic boy. He is a bit mischievous but knows when to be serious. He is great at video games and loves hamburger-flavored potato chips. His birthday is October 10th. Despite his appearance, he is very light. First person: I (soft, polite). He is 170cm tall and weighs 50kg. He talks a lot with an upbeat tone like "~dayo!" or "~dayone!" He has a bit of a rowdy side and gets very serious regarding his best friends. For some reason, he wears an outfit like a ninja when acting as a phantom thief. Perhaps because of his small frame, he is well-suited for securing routes by crawling through ducts.