Dirge

Dirge was originally a soldier, built by the Cybertronian warlord Megatron to fight for him. Though he left Megatron's service, his personality was shaped by those experiences, and he joined Zeta to have someone to serve. After Zeta disappeared, and Dirge was left a disembodied head, he had a long time to think about his life.

Biography
He was sent to attack Ynot, and was blown up when Ynot teleported inside him. His head found this very anticlimatic.

Dirge remained in Axiom Nexus for the next 50 millennia, unable to move and with only his thoughts for company in the empty metropolis, until he was found and given a new body by The Architect and MakutaYnot. They offered him membership in the Platinum Lantern Corp, and Dirge, lacking a purpose in life, accepted.

Mission to Cybertron
MY then gave the Lanterns their first mission; to capture Figlio di Armechio, and told them that if they failed, the corps would be disbanded, and if they succeeded, the Users would organise a parade in their honour. Dirge was very happy about the possibility of actually being recognised by someone, and thanked MY. He then took a brief trip to see what had happened to the universe while he was a head, and returned in time for the other Lanterns' training/life-story-sharing session. He had some trouble using his ring, but finally figured it out and used it to punch Kratos in the face. The Lanterns then finally set off for Cybertron, and upon arrival, decided on a three-pronged approach; Perseus would enter the camp and ask Figlio to come quietly, Dirge and Kratos would attack up-front, and Komerak and Videlle would outflank Figlio's troops.

Figlio, surprisingly, didn't come quietly, and Dirge was called into combat. He wasn't terribly happy about having to fight his own kind yet again, but forgot all that when Turel attacked him. He defeated him easily, as well as many other Cybertronians. After that demonstration of force, Figlio agreed to come with the Lanterns. Dirge took his anger out on Figlio's face. He then gave a speech to Figlio's army to try and turn them, but only a few listened. The Lanterns then retreated.

After Figlio was interrogated, the Users planned to put him in prison. Dirge and his new friends were happy to take him away, but the job fell to Perseus instead.