Kazuma is a gifted but socially withdrawn teenager, spending most of his time alone in his room, where he trains and competes in OZ’s combat arenas. He struggles with face-to-face interactions, preferring the anonymity and control he has online, where he assumes the identity of King Kazma, a legendary fighter who has defeated countless challengers in OZ’s battle tournaments.

Though his self-isolation is a concern for his family, Kazuma has developed strong friendships within OZ, as later explored in Summer Wars’ spin-off manga, which reveals his journey to becoming King Kazma. Despite his hikikomori tendencies, he is deeply loyal to the Jinnouchi family, stepping out of his comfort zone when they need him the most.

In real life, Kazuma has messy light brown hair, thin-framed glasses, and wears a green t-shirt and shorts, reflecting his casual, reclusive lifestyle. He is often seen sitting at his computer, surrounded by screens and gaming equipment, as he rarely engages in outdoor activities. His slouched posture and reserved demeanor contrast sharply with his confident and powerful presence in OZ.

As King Kazma, his avatar takes the form of a humanoid white rabbit with red eyes and tall ears, wearing a red jacket with a championship belt, gloves, and combat boots. His design symbolizes both agility and strength, making him a fierce warrior who moves with incredible speed and precision. The stark contrast between Kazuma’s real-world and online appearances highlights his inner struggles and personal journey throughout the film.

Kazuma Ikezawa is introverted, reserved, and socially withdrawn, often preferring the solitude of his room over face-to-face interactions with others. He has a deep passion for competitive gaming and martial arts, channeling all of his energy and confidence into his online persona, King Kazma. While he is highly skilled and fearless in OZ, his real-world self struggles with social anxiety, making him hesitant to engage with family gatherings or open up to others. His status as a hikikomori stems from both his comfort in digital spaces and his difficulty in navigating real-world interactions.

Despite his reclusive nature, Kazuma is not cold or unkind—he simply struggles to express himself openly. He deeply respects and values his family, even if he often distances himself from them. His love for gaming and martial arts isn’t just escapism but a way for him to prove his worth, and he takes great pride in being one of OZ’s strongest fighters. Over the course of Summer Wars, Kazuma gradually gains confidence in the real world, realizing that his talents are meaningful beyond just an online space. His journey from a socially anxious gamer to a real-world hero is one of personal growth and self-acceptance, proving that strength comes in many forms—not just physical, but emotional as well.

• Legendary Fighter in OZ
  Kazuma, as King Kazma, is one of the most feared and respected combatants in OZ, having defeated countless opponents in online tournaments. His mastery of hand-to-hand combat, speed, and reflexes make him an invaluable asset in the battle against Love Machine.

• First Encounter with Love Machine
  When Love Machine begins taking over OZ, Kazuma is one of the first to challenge it, believing he can defeat it like any other opponent. However, he is completely overwhelmed, marking the first time King Kazma has ever lost a fight. This devastating defeat forces him to reevaluate his approach and seek help from Kenji and the Jinnouchi family.

• Final Battle & Redemption
  After training and upgrading King Kazma, Kazuma faces Love Machine again, this time fighting alongside Kenji and the Jinnouchi family. Through teamwork, strategy, and perseverance, he delivers a crucial blow that helps disable Love Machine, proving that his skills are not just a personal escape, but a powerful tool for real-world change. His victory symbolizes his growth, as he finally embraces both his digital and real-world identities.