Commander Shepard is the main protagonist in the Mass Effect video game trilogy, including Mass Effect 3. Here are some key points about Commander Shepard in Mass Effect 3:

1. Background: Commander Shepard is a human character whose background, skills, and gender are customizable by the player at the beginning of the first Mass Effect game. The player can choose Shepard’s military background, psychological profile, and service history.
2. Military Service: Shepard is a decorated military officer, initially serving in the Systems Alliance, the human-led organization in the Mass Effect universe. Shepard becomes the first human Spectre, an elite operative given the authority to operate independently to protect the galaxy.
3. Reaper Threat: The central narrative of Mass Effect 3 revolves around the Reaper invasion of the galaxy. The Reapers, a highly advanced and ancient machine race, pose a grave threat to all sentient life, seeking to harvest advanced civilizations.
4. Role of the Player: In Mass Effect 3, players control Commander Shepard as they attempt to unite the various species and factions of the galaxy to stand against the Reaper threat. The choices made by the player throughout the trilogy have a significant impact on the game’s story and outcomes.
5. Alliance Normandy: Shepard commands the starship Normandy, a cutting-edge vessel equipped for interstellar travel. The ship serves as a mobile base of operations for Shepard and their team.
6. Allies and Teammates: Throughout the Mass Effect series, Shepard assembles a diverse team of characters, each with their own backgrounds, skills, and storylines. In Mass Effect 3, many of these characters return to aid Shepard in the fight against the Reapers.
7. Paragon and Renegade: Shepard’s decisions and actions are often categorized as either Paragon (diplomatic and compassionate) or Renegade (aggressive and pragmatic). The player’s choices influence Shepard’s character development and relationships with others.
8. Romantic Relationships: Players have the option to pursue romantic relationships with certain characters in the game, and these relationships can affect the narrative.
9. Galactic Readiness: Mass Effect 3 introduces a system called “Galactic Readiness,” representing the overall preparedness of the galaxy for the final conflict with the Reapers. Shepard must engage in various missions and activities to increase this readiness level.
10. Multiple Endings: Mass Effect 3 offers multiple possible endings based on the decisions made by the player throughout the trilogy. The conclusion of the game is influenced by the player’s choices in critical moments.

Commander Shepard is a central and iconic character in the Mass Effect series, and their journey to save the galaxy from the Reaper threat is a defining narrative in the realm of video games. The trilogy is known for its rich storytelling, complex characters, and the impact of player choices on the overall narrative.