Solo skits are... pretty difficult to pull off. Most of the solo skits I've seen were dances... or a character talking to the audience. I have only seen two solo skits that were successful at a masquerade. I think an Alice: Madness Returns skit could be promising. First you need to come up with some ideas to toy around with. Second, consider props and stage scenery to use for your skit. Now you say you want your skit to have a little action in it. That's good, everyone loves action!
What will Alice be fighting? She could be fighting a stage prop that you make of one of the enemies in the game. But... it would seem weird if shes slashing at some cardboard cut out that's just sitting there. Maybe you could get someone to be a stage ninja for you, to help bring your enemy props to life?