Boris serves as the loyal servant and accomplice to the sorceress Togenishia, forming a persistent antagonistic duo pursuing Lunlun across Europe. He is driven by Togenishia's promise to elevate him to nobility upon successfully stealing the legendary Seven Color Flower and seizing the Flower Star. This ambition fuels his unwavering, though often clumsy, efforts to hinder Lunlun's quest.

An anthropomorphic raccoon man with a chubby build, Boris consistently wears white gloves. His raccoon traits, particularly his tail, frequently betray his attempts at disguise, leading to comedic failures during covert operations against Lunlun and her companions. Despite this recurring flaw, he demonstrates skill in crafting disguises for infiltration and mischief.

Within the villainous pair, Boris functions as a comic foil, suffering the brunt of Togenishia's frustrations. His role as the designated "Butt-Monkey" involves frequent physical comedy and verbal abuse from Togenishia when their schemes collapse, underscoring his subservient position. He exhibits no significant evolution or known backstory. His actions remain consistently focused on aiding Togenishia's ambitions through sabotage, theft, and interference in Lunlun's mission. His portrayal is confined to his function as Togenishia's inept enforcer throughout their shared endeavors.