Kazuma Ikezawa is the 13-year-old second cousin of Natsuki Shinohara whose avatar is King Kazma, a renowned program/martial artist in OZ. Kazuma is also a hikikomori (social recluse) who seldom leaves his room and uses his talents to win every game in OZ. But it’s hinted that he does have friends, as more a spin-off manga made after Summer Wars telling about how he was able to become King Kazma.
Kazuma’s appearance involves tanned skin and short black hair with bangs that cover his right eye. His eyes are a dark brown, nearly black, color. He is very short for his age and is very thin. He wears a tank top with shorts and is always barefoot. He is mostly seen with headphones around his neck or on his head and in front of his laptop playing OZ.