Protein serves as Dr. Mudanashi's android companion under the primary villain Makuamuuge. Created by Mudanashi, Protein loyally executes schemes to harvest human negativity and force open a portal between the video game world and the human realm. His physique boasts exaggerated musculature, deliberately contrasted by flamboyant attire and effeminate mannerisms evident in distinctive gestures and speech patterns.

He exhibits a fleeting romantic interest in Sasuke, a robot allied with the protagonists, though this subplot remains underdeveloped and unresolved. Protein primarily engages the heroes in combat, leveraging his artificial strength in battles that frequently escalate into giant robot confrontations. His role persists as a consistent supporting antagonist in episodes featuring Dr. Mudanashi, devoid of significant evolution or explored backstory. No appearances or development exist for Protein in other media beyond the anime series.