Members of the two main factions—the Galactic Republic and the Sith Empire—will have different moralities; the project's key focus is to differentiate between the player's faction and morality. Each faction will contain different classes, each with a distinct backstory and a branching storyline affected by players' moral choices. Classes will also be exclusive to one faction or the other. All eight of the classes have been confirmed: the Bounty Hunter, Sith Warrior, Imperial Agent, and Sith Inquisitor for the Sith Empire; and the Trooper, Smuggler, Jedi Knight, and Jedi Consular for the Galactic Republic. Although each class will have a distinct storyline, they will be integrated with the game's overall arc. The Old republic will also use cover mechanics in gameplay.
Unlike traditional MMOs, classes in the Old Republic are not limited to the typical archetypes (healer, tank, melee dps, ranged etc...). Bioware has stated that each class will support on-the-fly customization that will allow any class to fill any role within a party, eliminating the need to spam channels in search of a specific class needed to fill a role within a group, which can delay or outright stop parties from completing group quests. While each class in The Old Republic will still favor a certain play style (be it ranged, melee, or otherwise), customization combined with companion characters will make for having a class be able to tackle many different situations, with or without the support of other player characters, and without requiring specific other classes in order to move forward.
Players' choices will permanently open or close storylines and affect players' non-player character (NPC) companions. The game's developers believe that the game will provide more context for characters' missions and quests than other MMORPGs offer. Every character in the game, including the player character, will feature full voice dialog to enhance gameplay, and interactions with those characters will feature a dialogue system similar to that used in the Mass Effect series. Players will be able to choose from a variety of NPCs, although spending time with a single companion will help more in developing story and content than dividing time among several, and may even develop a love interest. It is possible for players to "blow it big time" if they fail to meet NPCs' expectation. Players will also have access to dozens of planets, including Korriban, Ord Mantell, Nal Hutta, Tython, Coruscant, Balmorra, Alderaan, Tatooine, Dromund Kaas,Taris, Belsavis, Voss, and Hoth. Every player will receive his or her own Star-ship, which was announced at E3 2010.
