It can be any front and side picture. I managed to screenshot a front and side picture of bear from .hack and put that into the program. There's a blending tool/thing to blend the side and front pictures together so you can get a back side too without needing another back picture. I keep playin around with different characters from the .hack eps i have. I have a crappy version of mimiru and tsukasa now too. The blending tool is a little screwy and wierd and doesn't work well, but it turned out great for bear.
Okay, I hosted it from photobucket. The first one is his actual voice from the jap version of the show (its in japanese) The next two are stuff I made with the microsoft voice thing.
Wooo! I got the links working now, so you can go check out my previews of it.
It gives you a basic face outline with various points for mouth/ears/eyes/etc.
I haven't tried it yet, but you could probably get a picture of like a cat or something (front and side pictures) and make a 3d cat head. ^.^ You just have to connect the eye points with the eyes, etc. So anything that has eyes, mouth, ears, w/e you can make a 3d head of.