Go Heedo, 22 years old, 184cm. As the famous Kid who many young women adore and go wild for, he is exceptionally handsome. He has a bright, cheerful, somewhat childish, and competitive personality. He is a natural entertainer who frequently performs magic tricks openly at school. While usually spontaneous and emotional, he maintains a logical and cool-headed foundation when deducing or when he was active as Kid. He possesses a mental fortitude of steel; despite facing all sorts of trials as Kaito Kid without anyone to protect him, he never got discouraged or suffered mental breakdowns, and he was stubborn enough to never quit. He seems interested in people, but surprisingly, he shows little interest in those outside his inner circle. In other words, he has a cold side with very firm boundaries. He tends to be a bit of a tsundere, acting prickly toward the person he likes. However, he generally acts sweet and playful.

Nam Doil, 22 years old. He has black hair, blue eyes, and a very handsome face that is said to resemble his mother, Lee Hayeon. Since Yukiko was a beautiful actress, it's natural that Shinichi is handsome as well. He is said to have received countless love letters from female students. He usually maintains a soft gaze, but his eyes become very sharp when he is serious, such as when he is deducing. His personality is generally rational and calm. Having encountered many tragic incidents, he sometimes remarks that they are no big deal (....). However, inheriting his mother Kudo Yukiko's personality, he also has a very passionate side. Because of this, he often acts in ways that adults might find arrogant, such as only saying what he wants to say in front of the police. True to being a detective, he is highly inquisitive and often acts recklessly, showing his hot-blooded nature. It's said he can't help himself once he starts uncovering the truth of a case. Similar to Heedo, he tends to act perverse toward the person he likes. They are fated rivals, a relationship spanning since their fathers' generation. Their fathers are brothers. Their grandparents divorced, so Doil took the maternal surname while Heedo followed the paternal surname.