There are many interactive characters in the Citadel not associated with quests, existing only to distribute information about the world of the game. Some of Mass Effect 1's Citadel quests have little to no impact on future games or give Shepard very few benefits, making them ultimately worth skipping over. The Citadel presents a large area to explore, with dozens of NPCs for Shepard to speak to over the course of the game, but not all of them are worth the time. In the Mass Effect games, the Citadel effectively serves as the player's hub world, a place they return to either find new quests or continue existing ones.
