Benkei operates as a sentient "Brain Colony" artificial intelligence, analogous to his counterpart Leopard, serving as the central intelligence for a mobile space station. While his external form may have initially resembled Leopard's, Benkei adopted a new physical design after aligning with the Nervalists faction, intended to better reflect his personal style and personality. This redesigned form is dominated by an integrated giant chainsaw.

Benkei and Leopard share a longstanding feud marked by frequent mutual insults. Leopard deliberately uses the former name "Bonapart," which Benkei dislikes. Personality-wise, Benkei exudes notable vanity and arrogance, mirroring Leopard's own demeanor. The cylindrical armor structure visible beneath his head section is purely decorative; his core body structure resembles a flying saucer.

As a secondary character, Benkei exists within the broader conflict involving the Nervalists and other factions in the orbital colonies. His primary interactions involve Leopard, with their antagonistic relationship forming a recurring dynamic.