D-456, simply known as Digamma, is a member of the 3Darks as a replacement for Donovan Hutson, one of the 3 founders of the group. Calm, blunt, and highly sensitive with his feelings. He once harboured strong romantic feelings for Axel, a member of the 3Darks, and would get jealous against Memphis, who harboured self-gratification for himself and is highly deranged and narcissistic. But after Harold resetted the timelines where Memphis no longer exists, his feelings and memories were also erased as well, only becoming a silly, talkative spouting robot. Digamma is very loyal and friendly, but also very deadly and threatening against whoever opposes his friends.