Ferocious and loyal beyond measure, Beowulf is considered not a beast, but a sacred treasure of power. He belongs to His Master, Kazutora Arima, the Captain of Aspirants squad 4, but if he's not around then he'll obey whoever summons him. Beowulf is summoned by the words: "Step forward, secret treasure: Beowulf!" Beowulf's black fur is entirely electric and thunder runs through it all the time. His large and sharp claws irreversibly shatter reality, and destroy all creation.