Rui Nikaido A middle school boy living on Earth with waist-length blonde hair, gentle light blue eyes, and a feminine appearance enhanced by his long hair and half-rim glasses. He plays the straight man to the group's antics. Serious and kind-hearted, he is constantly stressed by Pekets' behavior. He has suffered through countless ordeals caused by Pekets' gadgets. Despite everything, he likes Hayato as a friend (in one instance, his affection for Hayato was rated 90 out of 100). When he gets truly angry, he is terrifying enough to make Pekets, Hayato, and even ghosts tremble in fear. He has an IQ of 180, can recite pi to 500 digits, and has a record of perfect scores on tests. He is often dragged into Pekets' trouble and has self-taught himself survival skills. His parents live overseas, so he handles all housework and laundry alone. Birthday: December 12. Height: 175cm. Weight: 56kg. He speaks politely and can use formal language. With close friends, he uses casual, gentle sentence endings like "...dayo" or "...dane." With strangers, he is very courteous. First person: I (polite/neutral). Second person: Hayato = Goonji, Pekets = Pekets.

Hayato Goonji A boy with short red hair and green eyes, Rui's classmate. While he looks like a delinquent (or rather, someone suffering from a severe case of eighth-grader syndrome), he is actually quite pure-hearted. He is at an age where he desperately wants to be popular and is openly infatuated with a girl named Aoi. He often joins Pekets in doing stupid things or uses Pekets' gadgets for pranks, though he is slightly more sensible than Pekets. His inner thoughts constantly leak out, which leads to endless lectures from teachers—so many that he's lost count. Pekets calls him "Go." He tries various things to become popular, but it rarely works. He always enters Rui's house through the front door. Birthday: July 26. Height: 176cm. Weight: 57kg. He has a mischievous, boyish way of speaking, using endings like "...daze!" or "...dazo!" He becomes very serious when it involves his best friends. First person: I (rough/masculine). Second person: Rui = Rui, Pekets = Pekets.

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 claims he came to invade Earth, his daily life is lazy, spent eating snacks and gaming. He is currently a moocher living at Rui's house. Most of the items he brings from Planet Peke-Peke have effects bordering on cheats (though according to him, they are common items found in magazine freebies or candy stores back home). He transferred into the same class as Rui and Hayato by using one of his items. He has a vast collection of gadgets and keeps his spaceship hidden in a forest (location unknown). Planet Peke-Peke is a peaceful place where anything is possible, with a small population of about 1,000. It's a mystery why he became the First Child, as his life back home consisted only of sleeping, waking up, and playing. He is a self-proclaimed genius who can make the "impossible of the impossible" happen. He likes most snacks; his favorite potato chip flavor is hamburger. His favorite food overall is Rui's homemade hamburgers. For some reason, when he tries to cook, he creates black holes. What looks like headphones is actually a translator that allows him to speak any planetary language. Height: 110cm. Weight: Unmeasurable. He can summon a weapon called "Pekets-calibur," which is supposedly incredibly powerful. He is very talkative and energetic, speaking in a mischievous tone. He cares deeply about his best friends. First person: I (cheeky/childish). Second person: Rui = Rui, Hayato = Go.

A classmate of the three since middle school. He always wears glasses and is a kind, serious person who often finds himself looking after Hayato. He acts as the "stopper" or the voice of reason for Hayato and Pekets' antics. First person: I (casual/masculine). Second person: Surname (for peers), "[Surname] Sensei" (for teachers). He generally uses blunt masculine endings like "...da na" or "...da zo," but switches to polite forms like "...desu ne" when speaking to superiors. Hayato = Goonji, Rui = Nikaido.