Daichi Niwa

Appears in episode 13 of the anime D.N.Angel when Daisuke travels 20 years in the future to retrieve the lost black stone of Shiira. As he chases the child who took the stone from the fountain in the park, Daisuke notices that he chases the child back to his house, where it is unveiled that his mother, Emiko-san, still lives there. She calls the child Daichi. Evidence points to the fact that Daichi is Daisuke's son.