Hayden (Dark Sector) vs. Grey Fox (MGS)
-Guns are obviously useless in this battle. Both have their signature weapon: sword & boomerang blade thing-a-ma-jig.
-All their abilities are also allowed: camo/invisability, forcefield, etc.
-elements are available to Hayden since, Im positive GF has a speed advantage over Hayden.
and in case you are wondering, Hayden has the full suit.