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Seemingly always calm and composed, never showing much emotion, Satoshi Hiwatari is a very distant, cold, and silent character, though these qualities never seem to affect how close he keeps to Daisuke Niwa. He is extremely intelligent, having graduated from high school at eight and graduated from Lagoon University at thirteen. However, he attends Daisuke's Junior High School, saying to Daisuke that he does so in an attempt to have a normal life. The reasoning for his ambivalence towards others is unknown, though most of the girls except for Risa and Riku like him. A possible reason behind his lack of willingness to develop friendships is his worry regarding Krad: if he feels emotion for anyone, Krad will attempt to use or kill that person.
He is the police commander in charge of capturing Dark, and due to his family legacy, he is almost obsessive in his attempts to capture the phantom thief. He is the sole living member of the Hikari family, whose artwork is almost always Dark's targets for stealing. He was adopted by a 26-year-old police officer whose family name is Hiwatari, so his name was changed to reflect his adoption. During the course of the story, he begins to care more about Daisuke's safety. He becomes a close friend to Daisuke and it appears that Daisuke is the trigger for Satoshi's curse, Krad, to appear, possibly because Satoshi is in love with Daisuke (hinted at multiple times in the series). Satoshi opposes Krad taking control of his body greatly, and has taken on an uncaring personality to 'seal his heart,' and thus, Krad. Krad is Dark's "evil twin", or opposite, a homicidal blond whose only motivation seems to be getting rid of Dark, Daisuke, and anyone else that comes between him and Satoshi. It is possible that Krad forces his way out of Satoshi, especially when he is angered by the presence of Daisuke/Dark.