Minister Edren is a White Mage, battling the dark forces. So, he is not too passive. He's a minor character and basically all his dialogue is in the vein of "No you won't, you soldier of darkness !", so a little bit more restrained anger or some other kind of tension would be good for him. He has a psychorigid vibe which is a nice change from the usual wise-and-holy look of priests. After all he's more country priest than archbishop. Minister Edren could be the first to have established a School of Mages on Wesnoth.