These are the other characters of "Peace Searching Neko-chan". Romiko is Yama's "owner" since she kept him when Yama stayed in cat form to hide himself. Chobi is an orphan boy who finds out about Yama's true identity. Heian....I can't tell since it'll spoil the story(go to my website if you ever want to find out at http://www.freewebs.com/hikayagami/ ). And Mizu is Yama's dead fiancee who only shows up in Yama's memories(which is why I drew her transparent).