I had a thought of taking a rat, and then snagging Improved Familiar to let it develop with me into a fiendish rat and then into a ratling.
I'd really like to flavor it as though my familiar is taking a new form each step, rather than being a brand new figure.
Is It justifiable to do that?
Also, anyone know if there has been an official Paizo stance yet on the old issue of if Witches have to lose all their spells when taking improved familiar?