Coatl

Coatl is the Dragon God known as the Auryn Dragon and the Fated Dragon God. She is also known as the Mother of All Dragons due to her having given birth to almost the entire Dragon race. She is currently sealed inside the Sacred Gear, Aurum Sphaera .

Appearance
Coatl takes the form of a young girl in her early to mid teens with white eyes and long flowing, pure white hair that goes past her rear, with the front bangs crossing her face. She's usually seen wearing a small white summer dress, along with 3 gold rings: 2 she wears as arm bands, and 1 she wears as a choker.

Coatl also has a secondary form where she appears much older than in her main form. In this second form, she looks like a tall, young woman in her early 20's with blonde hair

History
Very little is known about Coatl's past, though it is clear that she has lived since the earliest times of existence as she has shown multiple times how knowledgeable she is of past history. In chapter 40, Coatl was able to explain to the Protagonist why House Gremory was demoted during their transition from the original 20 Pillars to the 72 Pillars, including providing information on Rias's paternal great-grandfather, Vered Gremory, who lived during the reign of the Abdaddon clan.

Powers and Abilities
Immense Strength: Coatl's status as a Dragon God makes her one of the most powerful beings in the world, so much so, that despite her current state, all of her children show her great respect. Both Ddraig, the Welsh Dragon, and Ananta, the Aethereal Infinity Dragon, especially show Coatl great reverence.

Trivia

 * Coatl's name is derived from the same Nahuatl word for "serpent" or "twin".