Ukita is a short young man who has a short crop of black hair and small, dark eyes. He is normally seen wearing a suit and tie.
Ukita proves to be a strong character with great determination and bravery, as he was one of the few people who remained a member of the Kira Investigation Team until his death. Ukita shows these traits, as well as a lack of patience and a tendency to act on emotion, when he impulsively rushes to Sakura TV to stop the broadcast of the message of the second Kira.
When Misa Amane, the second Kira, has Sakura TV broadcast a message from her as Kira, Ukita recklessly rushes to the station to stop the broadcast, without any prompting by the rest of the team. Since Misa possesses the Shinigami Eyes, she kills him as soon as he approaches the locked door and is about to shoot the glass.
In the film, Ukita is portrayed by Ikuji Nakamura and appears notably older. Ukita does not die in the film; instead, Kanzo Mogi is killed in his place.
Obata said that Ukita is an "emotional" and "easy-to-understand" character who therefore was "easy to draw". When Obata designed him, he did not know that Ukita would die. Obata felt "really surprised" when he saw Ohba's thumbnails portraying Ukita dead.