Haine's younger "brother" who was also subjected to the Kerberos experiments, although the results began to take effect later. He shares Haine's spine collar and extraordinary healing abilities. Giovanni can be identified by his bug-eyed sunglasses and mop-top haircut. Although his "mother" Einstürzen genetically altered him, he works alongside her army.

Giovanni likes to taunt Haine, especially concerning Lily's death, hoping to induce a berserker rage. He has vivid and traumatic memories of the experiments he endured. He first appears in Dogs. He also wields dual Walther P38 pistols.