Tiamat

Known as the Cromatic Queen, Tiamat is the Lawful Evil Goddess of Dragonborn and Mother of Dragons. In the Dawn Age Bahamut and Tiamat united to create the first Dragons.
Differing wildly in the idiologies, Bahamut and Tiamat now fight to guide both Dragon and their Humanoid creatitions the Dragonborn. Tiamat is arrogant, greedy, hateful, spiteful and vain. She never forgives any kind of slight and completly focused on obtaining more power and wealth. She disdains mortals, regarding them as mere disposable tools in her schemes. When needed, she is charming, but her self-serving and reptilian personality always betrays her sooner or later. After having experienced relative mortality as an archfiend, she became less reckless but also paranoid.
She has an insatiable greed for treasures, but prefers that her followers bring it to her in the form of gifts instead of searching for riches on her own.