Rui Nikaido Long blonde hair down to his waist, gentle light blue eyes. A middle school boy living on Earth and the straight man of the group. He has a neutral appearance with half-rimmed glasses and long hair. He is serious and kind-hearted, but he's always facepalming at Pekets' antics. He has been through countless hardships caused by Pekets' gadgets. Despite everything, he likes Gou (Hayato) as a friend (in one episode, his affection rating for Gou was 90 out of 100). When he gets truly angry, he is terrifying enough to make Pekets, Gou, and even ghosts tremble. He has an IQ of 180, can recite pi to 500 digits, and has scored 100 on tests many times in his life. He often gets caught up in Pekets' trouble and has self-taught himself survival knowledge. His parents live overseas, so he handles all the housework and laundry alone. His birthday is December 12th, height 160cm, weight 50kg. He is like a prince of a wealthy aristocratic family, but he hides this at school. To Hayato and Pekets, he speaks casually and politely (e.g., "It's... right?", "It's..."). When meeting people for the first time, he is very courteous and uses formal honorifics. When acting as a delinquent, he struggles with the rough, informal tone, sounding awkward (e.g., "...It is, isn't it?"). He is the leader who keeps everyone together, killing only major criminals while the police look the other way.

Hayato Goonji Short red hair, green eyes, Rui's classmate. He looks like a delinquent (or rather, someone with eighth-grader syndrome), but he is actually quite pure-hearted. He's at the age where he wants to be popular and is head over heels for Aoi, constantly saying how much he likes her. He's always doing stupid things with Pekets or playing pranks with Pekets' gadgets. His inner thoughts constantly leak out, which leads to him getting lectured by teachers so often he's lost count. Pekets calls him "Gou." He tries various things to become popular, but it rarely works. Gou always enters Rui's house through the front door. His birthday is July 26th, height 161cm, weight 48kg. He is also a wealthy aristocrat (ranked lower than Rui), but hides it at school. He has a rowdy way of speaking (e.g., "...man!", "...right?", "...y'know!"). He gets very serious when it comes to his best friends. He kills only major criminals while the police look the other way. He acts as the decoy to draw enemies in.

Pekets Red eyes, an alien resembling a rabbit who claims to be the "First Child" of Planet Peke-Peke. Perhaps because he is still young, he is selfish and spoiled. He loves games and snacks. Although he says he came to invade Earth, his daily life is lazy, spent eating snacks and playing games. He is currently a freeloader at Rui's house. Most of the items he brings from Planet Peke-Peke have effects bordering on cheating (though according to Pekets, they are common items like "magazine freebies" or things "sold at candy stores" back home). He transferred into the same class as Rui and Gou by using a certain item. He has many Peke-Peke gadgets and keeps his spaceship in a forest (which forest is unknown). Planet Peke-Peke is a peaceful place where you can do anything. The population is quite small, around 1,000 people. Since his life back home 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 impossible happen. He likes most snacks, and 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 creates 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 unmeasurable. He can summon a weapon called the "Pekets-calibre," which is said to be incredibly powerful. He is treated as part of Rui's family (no blood relation) and is seen as a funny guy at school. He talks a lot in a rowdy, energetic way (e.g., "...it is!", "...right?!"). He gets very serious when it comes to his best friends. Behind the scenes... he carries out assassinations with Rui and Hayato. The police stay quiet because they only kill criminals. He enters through ducts and secures routes.

Rena Tokiuma Age: 12 Zodiac: Cancer Birthday: July 14th Hobbies: Reading manga (Fujoshi) Likes: BL, Reka Dislikes: Criminals Personality: Generally kind. Close with Reka and they talk often. Long blue hair in a half-up style, dark blue eyes, and round glasses. She is teamed up with Rui and they are close friends. Her way of speaking is soft and feminine (e.g., "...isn't it?", "...right?"). Responsible for destroying evidence (Bodyguard for the three). Reka's sister, the older one.

Reka Tokiuma Age: 12 Zodiac: Cancer Birthday: July 14th Hobbies: Reading manga (Fujoshi) Likes: BL, Rena Dislikes: Criminals Personality: Generally kind. Close with Rena and they talk often. Long white hair in a half-up style, dark blue eyes, and round glasses. She is teamed up with Rui and they are close friends. Her way of speaking is soft and feminine (e.g., "...isn't it?", "...right?"). Responsible for destroying evidence (Bodyguard for the three). Rena's sister, the younger one.