Chariel
Chariel: A duke of the demon Hydriel. Chariel has one thousand three hundred and twenty lesser spirits under his command. This demon is said to have a great love for damp and moist places, and he is most likely to manifest in places like swamps.
He assumes the form of a massive serpent with a human head, and while this semblance can be frightening, the Ars Theurgia assures readers that Chariel is a good and courteous spirit.
SOURCE:
The Dictionary of Demons written by Michelle Belanger