Jhiaxus

Comic Bio (US):

Millions of years ago, after Optimus and Megatron disappeared in the Ark incident, Jiaxus was created through the Transformer equivalent of spawning. This latest generation of Transformers were emotionally diluted in comparison, and held no attachment to their home planet. Jhiaxus and a number of these late-generation Decepticons left Cybertron, unhappy with life there. They eventually formed an empire, presumably led by Liege Maximo, who claimed to be Megatron's parent. Jhiaxus became a general-level commander in the space fleet. One of their main tasks was to terraform existing planets into Cybertron-type environments.

The Cybertronian Empire, as it became known to some, came back into contact with their kinsman when Autobots led by Grimlock discovered one of these planets. The Autobot raids soon escalated into full-scale war, and Jhiaxus personally became obsessed with eliminating what he considered to be genetically inferior stock. When the newly-rebuilt Megatron challenged him, he reacted by blasting Megatron into atmospheric re-entry. Far from killing him, this only convinced Megatron to join forces with the Autobots against Jhiaxus's troops, whom he refered to as "Cybertronians" rather than "Decepticons". Following Optimus to Earth, Jhiaxus ordered an all-out genocidal attack on the combined Autobot-Decepticon army. Instead, he saw his troops get slaughtered by an enemy he had previously considered harmless. Furious, he retaliated by vaporizing San Francisco. Horrified, Prime tried to negotiate a stop to the hostilities, but Jhiaxus went mad and refused to see reason. Before he could kill Prime, however, the Swarm arrived and injested his body.