Terry Bogard's from SNK's Fatal Fury, Zhen's from Dreamwork's Kung Fu Panda, Demoman's from Valve's Garry's Mod and this screenshot's taken from Garry's Mod.

When I was playing Final Fantasy 1, I completed it with only the Monks/Black Belts/Masters and, while they're cheap jobs for they don't use much weapons, armors, accessories and magic, it's also quite challenging for me to use them and had to use the healing items to keep them running. Their fists are quite powerful and would land such the critical blows.

As for Team Fortress 2, a Demoman using only his sword and equipped with the non-weapon-like equipment has proven himself just as challenging, for there's a little chance I can survive the bots longer, if you guys know what I mean. Plus, when doing so, you don't have to worry about finding the ammo floating above the ground.

I wouldn't think any games would be fun without challenging ourselves in any certain ways, so, yeah, why not give them a try, guys? I'd think the more challenging the games are, the more fun they are, don't you think?