All characters have different bones, different rotations of body parts, and so on. Therefore, USK has adjustment tools that will help you make any model work correctly.
First of all, open the adjustment scene (Tools -> USK -> Adjust), then place a character or a few characters to the Adjustment script and press the [Play] button.
- To change the camera type, press the [C] button.
- You can switch between characters during the adjustment.
Read about the further adjustment there: