Mandrake is a Celestial who acts as a humanoid vessel that can only be psychically piloted by two people at a time trapped in his conscience.

He brought an unknown prisoner to the material world, but saved Max when he was killed by the Wicker and brought him temporarily back to life, until Violet was put in his place.

He later taught a splinter version of Casper the methodology of becoming a Celestial, leading him to become the Clockmaker.

Mandrake in a bodiless form then released Violet completely and brought together all versions of herself from across the multiverse, giving her strong cosmic abilities. 

His state of being remains unknown.