Joker's ninja apprentice. He is happy-go-lucky and quite clumsy. He was born and raised in a ninja village, though he was a clumsy failure. He strongly adores Joker and makes sure to protect him. He refers to himself as Oira and tends to end his sentences with ssu, a shortened variant of Desu. He is very good at housework and cooking.
Miki is a young girl who lived in the slums of Shinjuku. Labeled as the "Lucky Little Ghost", those who meet her would fall for her smile, and are somehow befallen with good fortune later on. Previously, she lived in an underground section of Shinjuku Station alone after her mother had passed away several years before. After a hit-and-run accident, she would be adopted by Umibozu and would later on live with him at the Cat's Eye Cafe. Miki is unaware of who her father was, though it was revealed later to the other characters that he was the King of an unnamed country. He often visited Japan while on business and fell in love with Miki's mother who worked in an old bar in a quiet area. Because the political situation in the kingdom was unstable, when she became pregnant, Miki's mother left her job and disappeared. She raised her daughter all alone in an abandoned underground arcade so no one would be able to find them if they discovered their existence. Miki's mother would later die in an accident and Saeko would be the first of our heroes to encounter the little girl. Much later after Miki starts living at the Cat's Eye Cafe, Ryo and Xiang-Ying would find out the King had been killed and replaced with a double. All these events are kept from Miki to protect her. Although this Miki shares the same name as Miki in City Hunter, they are not the same character. Like the Miki in Angel Heart, the Miki in City Hunter was also an orphan and raised by Umibozu, though in City Hunter, this Miki is much older. Miki's hairstyle also appears to be similar to the original Miki in the third and fourth City Hunter series. (Source: Wikipedia)
Mina is Miho's younger sister. She has black hair in pigtails. Not unlike her family, she has a beautiful face, as noted by Takagi. (Source: Bakuman Wikia)
Age: 50 (debut), 60 (end) Birthday: September 10, 1968 The Assistant Editor-in-Chief at Shueisha's Weekly Shounen Jump. Later, he is promoted to Editor-in-Chief.
Koogy is a musician and a fashion designer. He announces at his last concert he is going to be a manga creator, one of the four chosen for the Golden Future Cup, with the idea his fans will fill in the questionnaires for him, trying to change the competition in, as Fukuda likes to call it, "a lame popularity contest".
Arai is a mangaka who is serialized in Jump. His manga debuted in the issue of Jump before Detective Trap. It is called Cheese Okaki. He used to work as an assistant for Mikihiko Azuma. Arai is friendly, mostly getting along well with whoever he meets. (Source: Bakuman Wikia)
Age: 45 Yosshi Miyoshi is Kaya Miyoshi's father. He is a real estate agent and a karate teacher. In 1st, 2nd, 5th, 6th grade, and most of Jr. high and high school, he was in the same class as Moritaka's uncle Nobuhiro, and they were best friends. They both had a crush on Miho's mother Miyuki, and they were somewhat rivals. When Akito had met with Kaya and her parents to discuss him marrying his daughter, Yosshi started to talk about Nobuhiro's death (without mentioning his name) and eventually he found out that they knew the same person and Moritaka was Akito's partner. So he asked Akito to call Moritaka over and the three went to a restaurant where Yosshi explained his past with Nobuhiro and Miyuki, and eventually decided to support Moritaka and Akito in their dreams coming true, and gave Akito permission to marry Kaya, even offering to get him an apartment. He is a chubby man with a goatee. His hair resembles that of a baby's hat. (Source: Bakuman Wikia)