Any or all of the following minifigs would work:
http://www.bricklink.com/catalogItem.asp?M=hor013
http://www.bricklink.com/catalogItem.asp?M=ncklc007
http://www.bricklink.com/catalogItem.asp?M=par049
http://www.bricklink.com/catalogItem.asp?M=trn091
http://www.bricklink.com/catalogItem.asp?M=trn068
http://www.bricklink.com/catalogItem.asp?M=trc004
http://www.bricklink.com/catalogItem.asp?M=ver011
http://www.bricklink.com/catalogItem.asp?M=air002
http://www.bricklink.com/catalogItem.asp?M=air005
I think I have light bley cylinders (cannon balls!) around. If not I’ll get some with the next order I do. I have a new monorail car design on the way and need some parts 😀