Kazuma Kuwabara is a student who attends the fictional Sarayashiki Junior High School. He is noted as the "second toughest punk at Sarayashiki", despite his unusual affinity for kittens. He is constantly picking fights with Yusuke to prove himself tougher, but never succeeding. Eventually Kuwabara's feelings of anger toward Yusuke become feelings of respect. Kuwabara has a very advanced sixth sense, though not as acute as his older sister Shizuru's.
Kuwabara ends up assisting in most of Yusuke's cases, gaining power over his own aura which he wields as a sword called the Aura Sword. Kuwabara also obtains the Dimensional Sword during the Chapter Black arc, a sleeker and cleaner spirit sword that possesses the ability to slice and cut through and between dimensions. During an early case he meets the ice apparition Yukina and instantly falls in love. Yukina is very appreciative to Kuwabara for saving her from captivity, but is oblivious to his affection. As the story progresses Kuwabara becomes more engrossed in his studies, choosing to cram for his high school exams rather than follow Yusuke and the others into the Demon plane, although he still