For all those with microphones it's:
Imitating characters in text is fun, but can you do it by voice? Grab a canon quote or a bit of your own RPing, try it out and post the links!
http://vocaroo.com/ See how close you can come to sounding like your character. If you sound absolutely nothing like your character, all the more fun, because no one is taking this seriously. What's more funny than mismatched accents, deep voices trying to sound high, and high voices trying to sound deep? Nothing! That's what!
(Bonus points: Try another player's character too if you want to).