Kaimaru is the son of a bandit leader, but is now in Tauemon's care.  Due to certain events in his past, he has lost the ability to speak, so his disposition is rather infantile.  Not long after these events, however, he becomes able to communicate with birds and beasts.  Those who have been by his side claim that he seems to have entire conversations with these creatures.

Kaimaru's carefree disposition and gentle heart make him a fast friend to all beasts.  He will care for animals in the pass to aid in various tasks.  Dogs, cats, ducks, and even a cow can be gathered at the animal pen to make life in the pass that much easier.