Jin's adopted 'pet' of sorts. Eon is an all-seeing eye creature that is native to Zhong and who's sole purpose is to protect the Underworld. When Jin was first appointed to the position of guiding spirits to the underworld Eon was assigned to help him.

Eon is a very stubborn and selective creature and never warmed to any Kowaiko until Jin. To everybody's surprise he immediately took to Jin and now sees him as his master, doing anything and everything Jin asks of him.

He often bases his opinions around Jin's, such as if Jin approves of someone Eon will as well, and will take it upon himself to watch over them and protect them on Jin's behalf.