Mirdane

Mirdane is a Quintesson from the cartoon portion of 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.}

Mirdane was an ancient Quintesson who was banished into another dimension by his comrades for being a criminal. The exact nature of his crime—and his body type—is unknown.

Fiction

Rewind can read... what, the language of fluffy clouds?

The Transformers cartoon

After the Autobots discovered the secret chamber in Planetary Corridor CB-311-B4, Rewind examined the hieroglyphics and learnt that the room was used by the Quintessons to banish their criminals to other dimensions. The writings on the wall said that Mirdane was banished to a dimension without substance. Madman's Paradise

3H comics

Merdane's [sic] fate was noted as Al-Badur and Cryotek were banished to the same lifeless void he once was. Wreckers: Finale Part II