@Bekkael - I think you will do just fine in the final confrontation with Grigori. Truth be told, the only place I died the first time I did it, was during a non-fighting portion (don't know if you want spoilers, so I left this vague...LOL). MA is a good choice. I have done it as an MA (first time through), and Assassin the second time. Here is a small list of (potentially...maybe) helpful hints:
1) Grigori is weak to Dark. If you have any weapons that deal that damage, they are a good choice.
2) If you have killed any of the dragons in BBI, you will have no real trouble with this dragon. Just know that he can and will "roost" at times. This can drag the fight out a bit, if your ranged weapons are not connecting with him.
3) Watch for possessed pawns. Not sure how Quinton and Shinon are set up with Possession protection (I think Chase currently is fully protected, but can't remember if that was the case for "bare-chested" Chase). To be on the safe side, bring some Placative Brew potions and hand out as needed.
And that really is about it. I have had Quintin with me for the Ur-Dragon before (at least I'm pretty sure I have...lol), and he has fought Firedrakes, Wyverns and Cursed Dragons with me in BBI. I would say he is "schooled" pretty well for Grigori (though, if you have those Dragon Scrolls, use them to give him a bit more learning.). HAVE FUN!
@Newschmoo - lol....yeah, it is a pity what (and how) we can gift pawns. But I'm sure you are going to want those arrows, once you start playing around with Ranger. They are fun to use....take health off of creatures pretty damn quick.