Peter Lorre

You can't see me!

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

Peter Lorre is some sort of famous being. He sounds like Boo Berry.

Fiction

Nightbeat mocked B'hgdad's claim to the Bird by referring to himself as Peter Lorre. Bird of Prey!

Michael McConnohie's voice for Cosmos in The Transformers is an intentionally bad impression of Peter Lorre.
Likewise Frank Todaro's turn as Dirge in "Theft of the Golden Disk" is based on Peter Lorre.