Dude, I am really diggin' the line style. Seriously. You will need to make animation frames for 'em, but they could work similarly to the way fish do. I took the libery of detailing a lil' bit. See if you like it. GK really has no aquatic enemies, and this would make for an awesome change. The idea of a lord-sized water enemy just kicks a whole lot of arse.
Also, I went back after uploading and tried fixing the transparencies. Can someone test this?