I'm running a support witch in a campaign, and I want to encourage roleplay using this character.
The character is a half orc scarred witch doctor.
I can roleplay that class well enough, but how should it be changed by the patron?
If your patron is transformation, and you are a scarred witch doctor, I would play with the idea of "modifications" on living creatures, through your spells and other methods, and having done a lot of these modifications to yourself, have a build-up of scars. I would focus on transmutation school buff spells (there's a lot to pick from), and if the GM allows it, describe them some flavorful changes to the target.
I'm the GM, this character is primarily support, I hadn't actually thought of transformation spells, but it works.
Body modification is a good idea.