Kazuma Ikezawa is a key character in the anime film 'Summer Wars.' He is a young, introverted boy with a passion for martial arts and technology. Known online as 'King Kazma,' he is a formidable martial artist on the virtual platform OZ. Despite his quiet demeanor, Kazuma is courageous and plays a crucial role in the film's storyline, using his skills to help combat the rogue AI, Love Machine. He is the cousin of the protagonist, Kenji Koiso, and his journey highlights themes of courage and the power of collaboration.