Absolutely amazing concept. I for one love it and really hope it gets implemented! As for ideas for the quotes, just make him sound like a grouchy hostile arsehole towards you, like he is to everyone, add a little bit of sarcasm into it. Imagine commanding him to move somewhere he'd mock you by saying "Is this how you spend your free time?" or "Ugh. How droll." hope those quote ideas kinda help. If not just look through some of his cut scenes from Legacy of the Void perhaps.