I'm not sure if I've posted here since it's a necro, but the blade-lock I've been planning is very reliant on spells and abilities that aren't available to other classes. He'll start as a F1 specifically for heavy armor and the great-weapon style. 2nd wind fits thematically too. Then warlock until the game ends. His first feat will be heavy armor mastery. Using a re-flavored fiend pact he'll gain temp HP every time he kills an opponent, and the heavy armor mastery will keep those temp HP going longer. Armor of Agythis combined with heavy armor mastery should greatly increase his damage output. Beyond that, I'm going to be playing it by ear. He may not be king of the DPS, but I think it will be a very flavorful warrior that will still hold his own in combat, have good survive ability, and do well in the social and exploration tiers.