The Redwall Character Guide
There isn't much for me to say here, but you'll hear it anyway, because I think quirks are always good to have in your character.
Quirks are really fun and interesting. Take my word for it, it's good.
Uh…how do I think of one?
Think of something interesting, different, and odd, and that is a very good quirk. And no, I'm not giving you any examples. This is totally up to you, and completely optional.
Not many people consider accents to be quirks. They're here because they're a lot like quirks, and because I'm not actually writing about them. Instead, I'm going to tell you to go over to http://www.geocities.com/starfiresredwall/studioA/studio3.php and read Starfire's wonderful write-up on the different accents of characters. Take a look at it, because it's good.