Appearance
Owing to Tiamat's Authority over the Sea of Life and her capacity for Self-Modification, she is capable of freely remodeling her Saint Graph, and therefore is unrestricted to any of her alternate forms:

Femme Fatale
Unleashed
Draconic Corpus
The Black Mud of the Sea of Life is also included in Tiamat’s height.[1] Her height matches the area of the Indian OceanWP.[4] However, given that the mud is made up of Imaginary Numbers, her weight cannot be measured.[1][4] Essentially the same 