Kazuma has blonde, unkempt hair and light brown teary eyes. He is generally seen as the "cry baby" of the bunch and is seen with rosy pink cheeks. He is the identical twin of Takuma and is always seen holding his hand or following him around.
He is the more conservative and fearful twin of the two, and he shares these traits as his father, Kousuke. He is easily startled by new things and cries easily in almost every situation, needing comfort from his twin brother frequently. Thus, he forms a strong bond with his twin even though he is easily discouraged at times when his brother's straightforward personality leads to him saying hurtful words. He generally needs ample encouragement to do the things that he wants, which has led to him being very dependent on Takuma. When an illness forced him the twins to separate, Kazuma's loneliness drove him to spend the whole day crying out for Takuma.
He is generally an agreeable toddler, avoiding conflict with the other children.
Kazuma's closest relationship is with his twin brother. He and Takuma dislike being kept apart from each other, and Kazuma cries out for his brother if they're separated for any duration. He often mimics Takuma's words and actions when interacting with others in the daycare room.
While the twins usually see eye-to-eye on many things, disagreements do come up every now and then. One of Kazuma's greatest fears is going into water, whereas Takuma loves playing in the ocean and in pools. Kazuma doesn't have much luck trying to get Takuma to play with him somewhere else. Despite his fear, Kazuma decides that he doesn't want to keep his brother and their friends from having fun, so he'll watch them splash around from a distance.
- Uma from Kazuma's name, means "horse."
- In Taka's "Ranger Five" game, he and Takuma are "Ranger Yellow."
- His zodiac sign is Libra.