Yukari

Yukari is Nue's shikigami and he's water serpent.

History
He is Aoi's first shikigami, a serving spirit, in his demonic form he has the appearance of a Mizuchi, a water snake. In his past life he was human, wrongly accused of being a demon, given as a sacrifice to the dragon god Ryujin, the god took pity on him and allowed him to be reborn as an Ayakashi of his own species.