Companions are playable characters that accompany players throughout the game. There are seven slated for release. Quests will require utilizing anywhere from one to four of them.
Interaction and character relationship are a huge aspect in Blackguards even to a degree where it influences combat.
Players should always consider the rising tension between the companions. Don't forget these are, after all, rogues and criminals, brought together by coincidence; they are far from your typical fellowship of heroes.