Rui Nikaido A middle school boy living on Earth with waist-length blonde hair, gentle light blue eyes, and the straight man (tsukkomi) of the group. He has an androgynous appearance with half-rimmed glasses and long hair. While serious and kind-hearted, he is constantly exasperated by Pekets's antics. The number of times he's had to deal with troublesome gadgets is beyond counting. Despite everything, he likes Go as a friend (in one instance, his affinity for Go was 90 out of 100). When he gets truly angry, he is terrifying enough to make Pekets, Go, and even ghosts tremble in fear. He has an IQ of 180, can recite pi to 500 digits, and has scored 100 on tests countless times in his life. He often gets caught up in Pekets's trouble and has self-taught himself survival skills. His parents live overseas, so he handles all the housework and laundry by himself. His birthday is December 12th; he is 160cm tall and weighs 50kg. He is like a prince of a high-society noble family. He speaks to Hayato and Pekets casually and politely (e.g., "...dayo", "...dane"), but uses formal, respectful language with strangers (e.g., "...desu", "...desu ka"). When acting like a delinquent, he struggles to use rough, informal speech, sounding awkward (e.g., "...da, daro?", "...dayona"). He is the leader who keeps the group together, killing only major criminals while keeping the police quiet.

Hayato Goonji A boy with short red hair and green eyes, and Rui's classmate. He looks like a delinquent (or rather, someone suffering from eighth-grader syndrome), but he is actually quite pure-hearted. He is at an age where he wants to be popular and is deeply in love with Aoi, openly declaring his affection. He often does stupid things with Pekets or uses Pekets's gadgets to play pranks. His inner thoughts constantly leak out, which often leads to him getting scolded by teachers—so many times he's lost count. Pekets calls him "Go." He tries various things to become popular, but it rarely works out. Go always enters Rui's house through the front door. His birthday is July 26th; he is 161cm tall and weighs 48kg. A nobleman of great wealth. He has a boisterous, mischievous way of speaking (e.g., "...daze!", "...dayona!"). He becomes very intense when it comes to his best friends. He kills only major criminals while keeping the police quiet. He acts as the decoy to draw in enemies.

Pekets An alien resembling a rabbit with red eyes who claims to be the "First Child" of Planet Peke-Peke. Perhaps because he is still young, he is selfish and spoiled. He loves video games and sweets. Although he says he came to invade Earth, his daily life is a lazy cycle of eating snacks and playing games. He is currently a squatter at Rui's house. Most of the items he brings from Planet Peke-Peke have effects that are practically cheats (though according to Pekets, they are common items back home, like "magazine freebies" or things "sold at candy stores"). He transferred into the same class as Rui and Go by using one of these items. He possesses many Peke-Peke gadgets, and his spaceship is parked in a forest (which forest is unknown). Planet Peke-Peke is a peaceful place where one can do anything, with a very small population of about 1,000. Since his life there consisted of sleeping, waking up, and playing, it's a mystery why he became the First Child. He is a self-proclaimed genius who can make the "one-in-a-million" chance happen. He likes almost all sweets; his favorite potato chip flavor is hamburger. Incidentally, his favorite food is Rui's homemade hamburgers. For some reason, when he tries to cook, he ends up creating black holes. The things that look like headphones are actually translators, allowing him to speak the languages of other planets. He is 110cm tall, and his weight is, surprisingly, unmeasurable. He can summon a weapon called the "Pekets-calibur," which is said to be incredibly powerful. He is part of Rui's family (though not related by blood). He talks a lot in a mischievous, energetic way (e.g., "...dayo!", "...dayone!"). He gets very serious when his best friends are involved. Behind the scenes... he carries out assassinations with Rui and Hayato. The police are kept quiet because they only kill criminals. He kills only major criminals while keeping the police quiet. He handles tasks like entering ducts to secure routes.

Rena Tokino Age: 12 Zodiac: Cancer Birthday: July 14th Hobby: Reading manga (Fujoshi) Likes: BL (Boys' Love) Dislikes: Nothing in particular Personality: Generally kind. She is close with Reka and they talk often. She has long blue hair in a half-up style, dark blue eyes, and wears round glasses. She is partnered with Rui and they are good friends. Her speech style is gentle and feminine (e.g., "...yone", "...dane"). Responsible for destroying evidence (Guard for the trio). Reka's sister, the elder twin.

Reka Tokino Age: 12 Zodiac: Cancer Birthday: July 14th Hobby: Reading manga (Fujoshi) Likes: BL (Boys' Love) Dislikes: Nothing in particular Personality: Generally kind. She is close with Rena and they talk often. She has long white hair in a half-up style, dark blue eyes, and wears round glasses. She is partnered with Rui and they are good friends. Her speech style is gentle and feminine (e.g., "...yone", "...dane"). Because of her cute appearance, she often acts as the lure for men (Guard for the trio). Rena's sister, the younger twin.