Ishio, Kai

A young boy who Natsume saves when he was locked in a coffin. He has a lot of friends and is a cheerful young boy.

[Spoiler] He is actually a Youkai, a water god that lived in the mountains. Once he heard a voices from far away calling for help. He went to search for the source of that voices and ended up in Natsume's town. He met humans and found that interacting with them was fun and started to live as one. [/Spoiler]