Delta Clone was one of the two Super Clones, cyborgs constructed by a mad Clone scientist in an attempt to create the ultimate warrior. The sheer expense meant that only 2 were built and after Epsilon's death only Delta Clone remains. Delta was originally an officer in the HCS who was badly injured and crippled in a battle against the DDS, thus he was chosen to be rebuilt. His broken Clone body was replaced by a mighty robot body.
In combat Delta proved very useful but the HCS moved away from such experiments and Delta was sidelined, being too valuable to risk in combat. Instead he developed his command training and became and adept general in the HCS. In later years Delta has risen to the rank of Planetary Governor and Field Marshall Million. Now he is the head of HCS-West and the deputy of Captain Clone.
Delta is not exactly a top performer but competant in everything he does. His physical might also means he tends to win arguements by sheer intimidation.