Commander Shepard is the main protagonist in the Mass Effect original trilogy. Born in the year 2154, Commander Shepard became the first human to join the Spectres. In the game Spectres are given special powers from the Citadel Council. When you first start the game you get to choose the gender, appearance, skills and history. The character is named after Alan Bartlett Shepard, Jr. the second person and the first American in space. Shepard is considered to be a highly skilled solider.
The ability for gamers to import the previous version of Mass Effect made the connection to Commander Shepard stronger. It felt like you were Commander Shepard and you took the decisions made in game seriously. Whether you waking friends, getting into a romantic relationship and even deciding who dies, you really embodied the character completely. For this reason I think Commander Shepard is one of the best video-game protagonist.