I don't draw the character or the background of my wallpapers ! I do "photomanipulation". The credits go to their rightful owner/creator.
I'll search all the credit I can soon, this way you'll be able to ask to the right person if you can use something or not.
I'm sorry for the owner of the drawings. I didn't ask for the permission. I'll probably delete my art if I find them and if they do not want me to use their drawings.