heavy/demoknight
heavy is the most powerful class in the game, if the enemy isn't expecting it, the heavy can just tear them apart!
demoknight is a scary melee-only demoman that, regardless of the situation, can just murder an entire team and gain everything from it, tide turner is the best shield! the speed you get from 4 heads is crazy and makes even hybrid-knight fun to play, your only weakness is a heavy and a sniper from a far away place... and a pyro who knows how to press m2... and crits :/
demoknight is crazy fun, i tell you that