Hige seems to know how to function the best in human society, even wearing a dog collar, although the true meaning behind his collar is revealed later in the series that is a tag/transmitter . He tends to use his intuition more than the others, but only when he's not thinking with his stomach instead. Hige is quite the ladies' man and is always on the look-out for a nice girl. He has the best sense of smell between the others. Hige seems to be a Himalayan wolf in the series. (Source: Wikipedia) Hige's name means "beard" or "whiskers" in Japanese.
Nagisa is a boy raised as a girl.
An old school friend of Ryousuke's father.
He was a noble man that helped Celiane and Apollonius fighting the Drak Angels until he betrayed them for his desire to become an angel himself. Beacuse of a vision, Reika thought that she was Celiane reincarnation but actually she is Scorpius reincarnation.
Kosaki's sister who is a school year younger. On her way to school, she is saved from some delinquents by a mysterious prince (actually Raku Ichijou) and ends up with his locket. Her first impression of Raku is negative as she observes that he is a womanizer who is trying to trick her sister and he is a pervert for looking at her panties. She also refuses to return his locket until Raku convinces her that he is helping the "prince." Unlike her sister, she is a good cook. She later reveals that she was helped by a guy in a mascot costume (also Raku) who treats her to ice cream. Later, she nurtures some feelings of love for Raku, but she later backs off, since she finds out that her sister, Kosaki, also has feelings for him. Instead, she decides to support her sister, despite her strong feelings for him.
Yoshida Ayumi is a student in Teitan Elementary when Shinichi was enlisted into her class after he had been shrunk by the drug APTX 4869. Shortly afterwards, Ayumi and her classmate Genta had the idea of investigating an apparently haunted mansion. They persuaded Conan to come along, and Genta also personally drafted Mitsuhiko when the latter expressed his criticism about supernatural hauntings. As it turned out, the haunting served as a cover-up for an old homicide case. Following its resolution, the foursome decided to stay together and form the nucleus of what would become the Detective Boys. For a time, Ayumi was the sole female member of the Detective Boys until Haibara joined the group. During a case involving a cache of stolen Italian gold coins just prior to the official formation of the Detective Boys, Conan saved the group from getting killed by the Mafioso who were also after the gold, earning Ayumi's gratitude which quickly developed into a serious crush. Ayumi is a naive and innocent little girl who shows courage from time to time and acts as the team's cheerful spirit. She has an open crush on Conan, which makes him uncomfortable, though Ayumi thinks that he has feelings for Haibara because he tries to protect her and she often sees them talking amongst themselves in private. Ayumi later becomes better friends with Haibara, and she allows Ayumi to use the more informal term Ai-"chan" to address her. When on a case, Ayumi often makes really simple observations that allows its progress and resolution. For instance, she unlocked one of the codes from the Momotaro container the Detective Boys found in Kurashiki by deducing that it was most likely referring to one of the statues at the Oohara Art Museum: they had to walk 25 steps from the statue towards the direction it was facing.