Don't really know what you mean but I think Arn is just really almost a true neutral or Lawful neutral character.  Of course, depending on what happens to Eilis, he might be pushed over to the Lawful Evil side lol. 

So believe it or not, my secondary story line falls really well into what you have provided already.  I almost want to discuss it with you so you don't think I am just copying you but it is funny how similar or logical it seems. There may be another reason why Arn and Eilis are so connected lol.