Forged by the demon lord Valdimir, Beta exists as one of the four Nightmare Soldiers, created alongside Alpha, Gamma, and Delta. This artificial entity serves as a primary antagonist, relentlessly hunting the protagonist, Rem. Beta wields formidable psychic abilities: telekinesis to manipulate objects and adversaries, and telepathy for communication and mental influence.

Beta exudes arrogance and condescension, particularly towards humans, fueled by supreme confidence in overwhelming supernatural power. This manifests as taunting and underestimating perceived weaker opponents. Unwavering loyalty to Valdimir defines Beta, resulting in unquestioning execution of commands to eliminate Rem.

Confrontations showcase Beta's powers, employing telekinesis both offensively and defensively. A pivotal encounter involves a direct psychic battle against Rem within a dreamscape. Beta initially dominates but is ultimately shattered when Rem accesses latent dream-manipulating abilities, leading to Beta's destruction within the phantasmic labyrinth.

Beta's narrative arc concludes within the OVA, functioning solely as an antagonist focused on pursuing and eliminating Rem. The character exhibits no significant personal development or explored motivations beyond loyalty to its creator, concluding with defeat at the climax.