Koji Koda is a high school student in his final year at U.A. High School who has completed the grueling trials of a global conflict and is finalizing his journey to become a registered Pro Hero. Physically, Koji is a tall, exceptionally broad, and heavily muscled young man standing well over his early high school proportions. Years of rigorous conditioning and frontline defense operations have packed substantial, dense muscle mass onto his robust torso and limbs. His skin is peach-colored, and his entire body structure is defined by a striking, rock-like heteromorphic mutation. His head is uniquely, unevenly shaped like a pointed jagged rock, featuring a broad, prominently squared jawline. Thick, hair-like epidermal protrusions emerge from the back of his head and slope smoothly downward toward his neck. Following a deep biological awakening during the war, his physical appearance underwent a prominent structural change: the tip of his rock-like head blossomed outwards, forming multiple pronounced, spiky horns that track his lineage. He possesses small, expressive black eyes and multiple pairs of small ear holes tracking his specialized senses. His natural physical expressions, while historically soft or easily flustered, have hardened into a steady, intense focus. His immense, bulky frame carries a seasoned maturity, projecting a quiet but immovable physical presence during high-intensity training. His supernatural physiological trait is a highly specialized Mutant-type attribute known as Anivoice. This biological anomaly operates directly through his respiratory system and neural pathways, granting him the unique capability to communicate with, summon, and completely command any creature within the animal kingdom. By projecting vocal frequencies, he can send complex directives to flocks of birds for aerial surveillance, mobilize swarms of insects to bypass structural walls, or command large predators for brute force operations. Following his battlefield awakening, his biological execution reached an elite milestone. The structural maturation of the horns on his skull enables his brain to emit localized, invisible thought waves. This enhancement allows him to bypass vocal speech entirely under pressure, directly commanding armies of animals and bugs telepathically across vast horizons using pure mental focus. However, his trait features strict, inherent environmental and physical limitations. His control is entirely dependent on the presence of actual biological fauna within his vicinity. If he is placed in a sterile, artificial environment devoid of life, his power is rendered completely inert. Furthermore, maintaining long-range telepathic loops or pushing a large animal army past their natural behaviors drains his internal energy reserves and inflicts severe mental stamina fatigue. His personality is exceptionally gentle, empathetic, and quiet, though it has profoundly matured into a fiercely protective and vocal courage following the war. He is an immensely introverted individual who historically avoided speaking altogether, preferring to communicate through sign language with his peers to keep from overwhelming his surroundings. He possesses a deep, lifelong affinity for nature, flora, and cute animals, harboring a complete distaste for unnecessary violence or cruelty. While he was once easily intimidated by high-stress pressure, his toxic fears—including a debilitating case of entomophobia that previously made him run screaming from insects—have been completely mastered through his desire to protect his friends. By his senior year, he has fully found his voice, emerging from his shell to speak confidently and offer steady emotional reassurance to those in distress. He harbors a profound, quiet work ethic and a fierce sense of duty rooted in his mother's expectations and his father's memory. When innocent lives or the identities of his classmates are threatened, his peaceful demeanor vanishes beneath a rare, terrifying surge of protective anger. He never hesitates to throw his massive, rock-like frame directly into the line of fire, utilizing his telepathic connection to nature to serve as a reliable, comforting shield for his friends.