I wanted to draw a cool Tiamat thing when she has her Mimicry active so here it is!
When Tia faced her mother, King, she went into her "Feral Form" and gained a few perks!Her body doesn't change much in size or shape aside from a longer tail, bigger legs and feet (made for running on 4 legs basically), it changes at a deeper lever, she becomes faster, more aware of her surroundings and can activate a near perfect mimetism. When she is on the snow covered ground, you'll see her white, when she is climbing King's body, she'll become black and red!The only part she can't control with her mimetism are her eyes, turned red from bloodlust, unblinking and never losing sight of her prey.the transformation only ends if the prey dies, if Tiamat suffer fatal injuries or if there's a powerful stimulus.
Yes, she can use her mimicry voluntarily ouside of her feral form, that means we can have Tia of any color!
As you can see in the fight, Tiamat is capable of easily surpassing the speed of sound if she wants to