Kazuhiko Torishima is a member of Jump's Board of Directors and was a former editor-in-chief of Weekly Shonen Jump. Like other editors shown in the Bakuman series, he bears a distinctive resemblance to his real-life counterpart. (Source: Bakuman Wikia)
A child soldier. His parents were killed by an airstrike by a F-22 Raptor. Picked up as a child soldier soon after this traumatic event. Despite his intense hatred of weapons, Jonah decides to work under the enigmatic arms dealer, Koko Hekmatyar. Though he is young, his skills on the battlefield are extraordinary and is frequently shown besting men much older than himself. He managed to slaughter an entire army base before being stopped by Chiquita. He is an expert in mountain combat. It is revealed that he made a contract with Kasper Hekmatyar, trading his combat skills for the safety of three orphans. Also, infrequently displays a childish nature. Is shown to dislike mathematics and science and excels at languages. He has stated that despite his past, he still loves the world. He is against senseless killing and nearly shot Koko because of her plan. His primary weapon in season 1 is an FN FNC and in season 2 it is the Magpul Masada.
A CIA asset in South Africa assigned to work with Scarecrow. She's more sympathetic to Koko and secretly works as Koko's informant. (Source: Wikipedia)
A fifteen year old prodigy, whose most prominent feature is his hair, often called "rooster hair" by his colleagues. Maruo Eiichirou is a diligent student and somewhat of a perfectionist. He earned his nickname "Ei-chan" because he keeps getting straight A's on his exams. Although an honor student, he lacks in exercise, and as a result, ends up joining the Southern Tennis Club (often abbreviated as STC). It is revealed later on in the manga that his mother was the one who suggested joining a tennis club. He starts off as a naive beginner who has trouble in trying to catch up and learn the basics. However, he soon paves his way against tougher opponents such as seeded players in prefecture tournaments. After learning he needs to improve for the upcoming hurdles he will have to face, he takes up the suggestion on flying to Florida in an attempt to improve his overall performance in tennis. Although he loses his practice matches in the first few days, he eventually improves and even beats Alex, a professional player who is included in the world's top 1000. He has romantic feelings for Takasaki Natsu or Natchan, as he calls her affectionately, his fellow club and schoolmate. Later on in the manga, they start going out.
He is an anime-original character, originally the assistant of the machinery development department. Though he and his partners have come up with many ideas about how to make a virtual Embryo or catch the Embryo through X-Eggs, mostly resulted in failures and despised by Kazuomi.
Loni was raised in the Dunamis Orphanage, but left to join the Order of Atamoni; he is like an older brother to Kyle. Thanks to his rather frivolous manner he gives the impression of being irresponsible, but in fact Loni is resourceful and has a strong sense of justice. He acts as a voice of reason to Kyle, keeping the boy's overeagerness in check. Over the course of the story, Loni develops a romantic interest in Nanaly that is ambiguously reciprocated and abruptly terminated near the end of the game. Loni is tough and can deal large amounts of physical of damage, but his attacks are relatively slow; he prefers to fight with polearms. (Source: Wikipedia)