Great Idea with Excellent Execution!
Nicely done! Not only is the combination of DBZ, Super Mario, and Sonic unique, its quite brilliant as well. I never would've thought of bringing the three together for a single project, but you've done it with great results! Your use of some of the newer sprites rather than just the old stuff is like a breath of fresh air into the sprite community, and I've got a mind to go back and check out your earlier works in this series even though I suppose I know a few spoilers for them.