The companions section deals with the dozens of character companions encountered throughout the story. Most of these require playtime with each companion which should be quite easy if you use them to complete the story and other quests in the game.
General
Agent
Bounty Hunter
Date Night
Jedi Consular
Shared
Sith Inquisitor
Sith Warrior
Smuggler
Star Fortress
Jedi Knight
Trooper
Unobtainable