Chromatron

Chromatron is a neutral Cybertronian from the Transformers: Prime continuity family.

You can't see me!

_{This character has no official visual representation in any Transformers product or media... yet, at least.}

Chromatron was a renowned artist in the days before the Autobot/Decepticon War. He lived as part of a colony of artisian manufacturers around the Lower Pool of Polyhex.

Fiction

Exodus: The Official History of the War for Cybertron

Chromatron was working on a new piece of art, a projection model portrait of the suddenly prominent revolutionary Megatron, when terrorists, inspired (perhaps directed?) by that same Megatron detonated bombs that sent the cliff face above and the high-caste houses constructed there, cascading down into the molten Lower Pool, killing him.