Voodoo

Voodoo is a being from an unknown continuity family.

You can't see me!

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

Voodoo was a being of phantasmal horrors. Vector Prime considers them to be one of the multiverse's greatest villains.

Notes

Voodoo was one of many new characters name-dropped in the Facebook edition of Ask Vector Prime on the final day that Vector Prime ran his column as a multiversal singularity.
Voodoo's background, including their gender and species, therefore remains unexplored, but if Voodoo is a Transformer, then they are probably a Decepticon or a Predacon.
Voodoo is a set of spiritual beliefs and practices developed by the African diaspora and most prominent in Louisiana and the Caribbean. Thanks to U.S. popular culture, "voodoo" is often used as a synonym in the English language for magic.