One of Emperor Darius' generals. Has thick armor which doesn't allow anyone to see Proist's face. Proist has as a mechanical voice and very silent temper until the moment of reveal Proist's true individuality.

Spoiler

She is actually a Emperor Darius' daughter. She has split personality so she can be kind and merciless at the same time. She hates humanity and all human-related things except classical music. She is fond of Antonín Dvořák, and even names her mech (Dvořák) as a tribute to a composer.