Orochi

Also known as Yamata-No-Orochi (Giant eight branched serpent), Orochi is a primordial serpentine yokai from Japanese mythology who, after being slain by Shinto thunder god Susano-o, has sworn to kill anyone even so much as related to him.

Characteristics
Name: Orochi

Alias: Yamata-No-Orochi, Eight-headed Garter Snake (by Perseus), Garden snake

Age: Unknown

Eyes: Cherry-Red

Hair: None (though he's covered in moss)

Likes: Devouring maidens, Sake, getting revenge on Susano-o (and by extension his family)

Dislikes: Those related to Susano-o, falling for the same trick twice, being denied his vengeance, being slain (it takes him thousands of years to reassemble), oni (for their incompetence)

Family: None

Appearance
Orochi is a massive dragon/snake-like yokai with eight serpentine heads (seven circling a much larger head in the center) and eight constantly whistling tails. He is so gigantic, he can be mistaken for a small mountain range. Due to his massive size, he has a small forest growing on his back. Each of his sixteen eyes are cherry-red and seem to glow in the dark.