Ripping Questions

[Hsean]

So, I kind of solved the first problem... I'm still not very experienced with Photoshop, but looking on the web and in the software itself, I made it: I cut the background with the Magic Wand, with Tolerance at 32 (by default... don't really know If I had to change it...) and Anti-Aliasing/Smothing turned off like you told me. However, in the new picture there're a couple of things messed up. Here's the, ehm, LINK to it, and what I noticed is:
1) The borders seem to have some white left around them and aren't really "perfect" as I hoped (perfect meaning like the borders of the other monsters). Can the Magic Wand or some other option fix this?
2) For some reason the Magic Wand also selected some of the insides of the picture, around the mouth, and cut it, resulting that now I see the blue sky of the BG around the mouths. Do you know why the Magic Wand cut also those parts and If it can solve the problem?

While about the previous second matter, I solved it with the 2nd method you told me, thanks! I didn't understand well the first one, however:

you could try unlinking the Width and Height and try entering both values, but that'll make the background look ugly, and distort. You may prefer to have the black bits.

...and If It's better than the second one with the Canvas Size. What are these black bits? Just to know the best method to fix the Backdrops found in this site and put them in RM2k without losing too much quality.

Thanks again for the support, I'm learning many new things.