Ibuki-Douji

Ibuki-Douji is known as the Fragment of the Great Serpent God's Spirit (大蛇神の分け御霊). She is the child and Divided Spirit of Yamata-no-Orochi and origin of Shuten-douji. She is also known as Orochi's daughter. She is a Divine Spirit and one of Japan's Three Great Monsters. The other name of the "Shuten-douji" from the base of Mount Ibuki.

Ibuki-Douji, whose birth was impossible naturally, that is, she came into this world as an oni child, grew up in the mountains and eventually gained fearsome abnormal powers. It is said she moved to Mt. Ooe and became the great monster "Shuten-douji" who descended on the capital, entertaining herself with massacre and pillaging.

Ibuki-Douji is massive in height and has four black-and-purple curled horns coming out of her head, having purple-grey skin and light blue hair with pink streaks, and grows a long snake tail out from her back, yet she's still depicted as a beautiful woman with enormous breasts and wide hips. She also has a large metal halo behind her back, denoting her status as the avatar of the divine eight-headed serpent.

Her first Ascension depicts her in her freshly hatched child form. She's a giant by default, but uses her powers to downsize herself when interacting with regular humans.

(Source: TYPE-MOON Wiki)