Tiamat

After defeating Nero Draco and returning to chaldea. In the middle of the night as you return to your room, strangely you can smell the scent of fresh food from your room. Not thinking too much about it you go throught the gate, and what is behind is a surprise you would never have expected...  -Unable to endure the situation where the humanity of 2016 that defeated her was about to be destroyed by a "calamity that came from the sea" just like her in a certain parallel universe, the Beast of Creation manifested in her juvenile form. Tiamat created a clone of a "setting where she reset herself and was reborn" and sent her to Chaldea. She also has clear memories of being taken down by humanity once. The reason this Divine Spirit-class Servant always seems to be pouting is due to the disgrace and pain she feels from being beaten, but her affection towards us that makes her want to protect humanity is way greater than those feelings.