Little Rat is a sly little thing that acts innocent but was plotting behind Black Cat's back all the while. Here's a comparison of the initial 2D design and the final 3D turnaround.

2D Character turnaround

3D Character turnaround

This is the hierachcy of Little Rat's setup.	Face Control	Head and ears control

Arms, hands, legs and feet controls	Tail control is divided into 3 sections.

Default	Eyes closed

Watery pleading eyes	Sly wicked eyes