Abacus

Abacus is a Decepticon warrior from the Generation 1 continuity family.

You can't see me!

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

Abacus is a Decepticon soldier.

Fiction

Timelines: Wings of Honor continuity

Abacus bickered with Datamine and Deadbolt about the mission they had received from Megatron, which Datamine accurately described as "'His' only expectation is that we die!". He was then presumably destroyed when Halo rained death from above. A Team Effort