It's not the most amazing thing, but it shows an effort was made to make something entertaining.
Although the clips were a bit quick and nonsensical, each one was completely different so nothing felt "stale."
Maybe work on the voice acting a bit: Practice so that you're comfortable with your ownvoice, and you should eventually get better at your impressions. Also, this is Newgrounds, so if you watch the boards, I'm sure you may find somebody extra willing to provide additional vocal range for characters.