Birthday: December 25 Age: 8 (Beginning) 16 (Current) Ren is a hardworking, honest, straightforward and trustworthy child. He has an affinity for dogs and a strange obsession with rice. He is currently living with Haru and his brothers, twins Aki and Shima. Although he is in their care, Ren is very mature for his age and hates being treated like a child, especially by Haru. He loves Haru but would rather put that man's wishes above his own. With an intelligence and perception above average for his age, he prefers to keep to himself and doesn't like to burden others with his insecurities. Due to a complicated childhood and no memory of his biological parents, he is quite naive about the world but is gradually adapting to his new life in Japan.
Kaidou Shima is one of Haru's brothers, who is currently studying in college and working as a part-time tutor. He is composed and cool character. Also has a twin brother named Aki.
Kojima Genta is a student in Teitan Elementary when Shinichi joins his class as Edogawa Conan. Shortly afterwards, he and his classmate Ayumi decide to investigate an apparently haunted mansion, and they persuade Conan to come along. When their friend and classmate Mitsuhiko expresses his skepticism about supernatural hauntings, Genta forcefully 'persuades' him to tag along as well. As it turns out, the haunting is a cover-up for an old homicide case. Soon after, the accidental acquisition of a treasure map leads Ayumi, Genta, Mistuhiko and Conan on a hunt for a cache of stolen Italian gold coins, during which Conan saves them from getting killed by the mafia members who are also after the gold. After the case is resolved, Mitsuhiko joins Genta and Ayumi in forming the nucleus of an amateur detective group, the Detective Boys. Genta is quick to pronounce himself the leader of the group, but his lackadaisical leadership abilities are commonly neglected in the field, and in fact everyone (even Genta) unconsciously views Conan as the group's actual leader. Genta's school shoe locker is used as a mailbox for any of their fellow students to present them with a case to solve. Genta loves food, especially unagi, and can eat more than all the other Detective Boys members combined. When discussions of money come up, Genta tends to think about it in terms of how many unagi bowls he could buy. He also tends to mess up certain Japanese terms with similar-sounding words (especially if the latter are related to food) and sometimes has trouble reading even the most common Kanji, which on occasion causes some ridicule from his classmates and friends. His brash personality, lack of awareness of his surroundings, and tendency to not think before acting often lands the Detective Boys (or at least himself) in sticky situations. Even though he is brash, outspoken and can be intimidating, Genta is actually very kind and dependable. He is a good friend of Ayumi and Mitsuhiko, and has been shown to greatly admire his father, who is considered to be a classic "Child of Edo". (Source: Detectiveconanworld.com)
Kaji is in the same grade as Ayu and Nina, and is also the school idol. He is considered cool and always has a nice smile. All his fans are constantly giving him presents, and he even has admirers from the 3rd grade. However, this is only his outer mask. Kaji is in reality a normal guy who hates being given presents by people he doesn't know. But he is working hard on his "nice person" persona because the girl he likes, Ayu, once told him that's the way she liked him. He becomes closer to Nina after she discovers his deception. He is an introverted person, and doesn't like giving away his real feelings or thoughts. Kaji belongs to the school's baseball club. His best friend is Tsujiai.
Tsujiai is a classmate of Kaji, Ayu and Nina. He is the head of the male tennis club and is a slightly extravagant person. Ayu seems to hate him because at the start, he always managed to destroy her chances with Kaji one way or another. Tsujiai introduces Nina to Doraemon (which she loves). His best friend is Kaji and he likes Nina which is shown more in the manga than in the anime. He has a cat name Shinnosuke and is the third person to know that Nina was a magic girl because he saw that Rio the cat transforms into a human.
Jean Henri Fabre first appears in the beginning of the first episode, when he attempts to steal the "Immortal Beloved." He rides a giant mechanical grasshopper and can control bees and other insects to use as weapons. Like the insects he studied, juvenile Fabres are shown moulting from one form to another, growing from child to adult in a few days. Two Fabres are shown in the series; the first Fabre apparently dies by crashing into a Tokyo office building, but actually moulted and escaped, taking the form of a child until he fights and is killed by Drake Anderson within the I-Jin base.