hi I was wondering if it is possible to extract or copy the in game models, so I can add a few features like beaked helmets and power claws (like the Raven Guard)
Yes it is. Ideally you need 3ds Max and Santos' Tools though. See this thread: RelicNews Forums - Santos' Tools
Yeah, but if you want to change the weapons that they have, you can go into the peoples file and change the weapons.