Originally Posted by The Hag
DO stay in character whenever the audience can see you.
To make a tangent off of this point with a "things I've learned from my mistakes" anecdote: I learned that this also counts when you're leaving the stage. I took part in a skit in May with seven other cosplayers, and after we performed our skit, I was later told that our exit was a tad awkward. We had several bulky costumes in our group and we didn't exactly plan our exit, so we ended up slowly shuffling into the narrow stairwell leading offstage in a disorganized manner. Oops. To remedy this, perhaps we should have made sure that people went off in the order of who was closest to the exit, and done so gracefully. :P