They are set up for third person character, and there script is AI_Neutral.lua
The script just makes them look in your direction.
If you want to use them as other characters for enemy, you will need to duplicate on of the FPE and bmp files and change the name.
Open the FPE file in notepad.exe and change isthirdperson = 0
You can try changing the weapon, but the wizard only has the staff animations in it, so may not exactly look right for some weapons.
Take note of the animation calls at the bottom of the file.
When done making the changes, save the file.
Now you will need an AI script that will do something for you. This will involve some coding and trial and error to get correct.
That should get you going.
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