On of the perks of beating the battle mode with a certain character is that you unlock the "secret" character files in the gallery section. In the game, every battle you beat, you earn points. With these points you can fully open the secret files. Usually, though not all the time, the image is coupled with a character voice over.
Good news! I found a program that lets you browse images on Playstation game discs, so now not only are the images much better quality, they're 3 times larger and there are more to boot!
Ten no Ryu | Chi no Ryu | Others