These should do the trick, as long as you don't put them against a dark background. By the way, Dissidia_OnionKnight.png already had an alpha channel. http://up.ppy.sh/files/alpha_request2.zip
Edit: I forgot to resize the images. Either way, images used in storyboards should be less that 641 pixels in width, and less than 481 in height. Edit2: Resized the images.
Placeholder signature. Will probably replace this tomorrow.