Most of the game's combat-oriented companions are mages of some-kind. I think it would be nice to have more companions who are desinged to either be spellblades or pure physical fighters. Maybe some Bandit Queen who you can capture after finishing a unique dungeon, a wandering sellsword who you hire (who can be tricked by PC into becoming their property) or an enemy knight (I'm yet to reach act 4 but I assume at some point the player will end up in conflict with the Empire, so maybe you end up capturing one of their high-ranking officers and making them your slave)