Kazuma Kuwabara (桑原 和真, Kuwabara Kazuma?) - Kuwabara is the second toughest kid in the school, and resents Yusuke for it. Originally rivals, Yusuke and Kuwabara would start a grudging friendship that only strengthens throughout the series. Although human, Kuwabara has high Reiki sensitivity; shortly after accompanying Yusuke on missions, he is able to manifest a Rei Ken (Spirit Sword in the English dubbing); a type of Reiki that normally takes on the shape of a glowing sword. After the Dark Saga, Kuwabara is believed to be the strongest human alive (Genkai implies this). Though he may not be the strongest in the "gang", he is certainly the kindest, as he has a certain affinity for kittens