d-16 (transformers one)

A fictional variable geometry robot character from the Transformers mechaverse.

He is a re-imagined version of the original Transformers: Generation 1 Megatron of a closer lore towards his path to tyranny and revenge.

Started as a miner, a non-transforming robot who's friends with Orion Pax, he himself united as Brothers. He acquired the transformation cog later on by the power of Alpha Trion. D-16 later evolves into Megatron as he sees Orion's heavily damaged body, but Megatron let off the body and killed Sentinel Prime by splitting him in half (a reference from the 2007 movie)
He's also the one who started the movement and the faction known as "Decepticons"