i used to play metal slug... do you want your characters to look like the in-game characters, or the characters in the promotional artwork? they look quite different.

in-game:

http://www.classic-consoles.com/gam…marco1.jpg

promo art:

http://www.acegamez.co.uk/blog/uplo…710199.jpg
http://www.localarcade.com/arcade_a…2/slug.jpg
http://spyhunter007.com/Images/meta…poster.jpg