Tiamat

Queen of the Dragon army and chief divine of chromatic dragons, Tiamat seeks to swallow the world of Krynn with her draconian army.
Tiamat was arrogant, greedy, hateful, spiteful and vain.[17][30] She never forgave any kind of slight[30] and was focused on obtaining more power and wealth. She disdained mortals, regarding them as mere disposable tools in her schemes. When needed, she was charming and fey, but her self-serving and reptilian personality betrayed her sooner or later.[17]
After having experienced relative mortality as an archfiend, she became less reckless but also paranoid.[6]
Tiamat enjoyed the company of dragons, and had many great wyrm consorts of the chromatic varieties.[31]
She had an insatiable greed for treasures, but preferred that her followers brought it to her in the form of gifts instead of searching for riches on her own.[17][4]

Tiamat appears as her humanoid avatar.