ROLE IN THE TEAM
Wally is a proficient grappler, but he can pretty much do a little bit of everything even if he is not the best at it. However, what makes him stand above the rest are his shields, which make him tough as a brick wall and gave him his nickname. He uses them to protect himself from meteorites and space debris, generally while grappling somebody and causing them to collide into all sorts of nasty terrain.
Wally's special abilities allow him to ignore tired tokens and wounds caused by area terrain, which makes him a very good option to grapple opponent flyers and then stay on top of an asteroid until the end of the round. And if you really hate a particular flyer, you only have to do this twice to get rid of them forever!