Kairi Sanjou

The boy serving as the new J-Chair. He is tall, but actually he is two years junior to Amu. He prepares for Guardian's activities. Though the youngest, he is so capable Amu and Yaya call him "class president". He wears spectacles.

When Kairi character changes with Musashi, his hairstyle changes to match his Guardian Character. He wields a bokuto for attacking or to defend with a green shield.