An enigmatic, masked man who works for Klein Sandman, Raven is completely loyal to his master, never sharing any personal information about himself. Raven oversees the Earthgertz's training, combat simulations and attack situations against the Zeravire, and occasionally answers to the EFA about Sandman's involvement in the extraterrestrials' invasion, in place of Sandman himself.

Big Spoiler

In Gravion Zwei, it is revealed the current Raven is actually Ayaka Shigure, Eiji Shigure's sister. The mask holds the memories of the original Raven, a former colleague of Zieg Zeravire on his homeworld of Llambias. The previous holder of Raven's mask was Luna Gusuku's father Isana, before he passed it down to Ayaka.