gilthor

Glithor is a fused up Decepticon Machine came from Optimus Prime and Megatron from The Transformers

His Origins came from the Quintessons made with Cybertonium that is common for Transformers, he is a Decepticon. (despite being look alike from Optimus Prime)

From tfwiki:

The Colossal Cannon Soldier Gilthor (ギルトール Girutōru) is a bizarre, vicious fusion of Optimus Prime and Megatron, built by the Quintessons. Created from the same Cybertonium alloys which made Optimus Prime so resilient, and boasting a Destrogun many times more powerful than Megatron's fusion cannon, his combat power exceeds his predecessors' in nearly every way.

Gilthor, however, is ultimately a lifeless shell, animated by the ghost of Starscream, causing him to succumb to the same weaknesses as the Decepticon jet.