In Assassin's Creed Rogue, what is the full name of the playable former Assassin who joins the Templars?

The playable former Assassin who joins the Templars in Assassin's Creed Rogue is Shay Patrick Cormac.

Shay begins the game as an Assassin operating in the North Atlantic during the eighteenth century. After a disastrous mission connected to an ancient artifact, he rejects the Brotherhood and eventually becomes a Templar. The game presents the conflict from the opposing side, making Shay a notable exception within the series.

His change in allegiance is not simply a costume change: Rogue's story follows Shay as he hunts former allies and helps the Templars pursue Assassins. This perspective is the central premise of the game and explains its subtitle-like reputation as an Assassin's Creed story told through a Templar's eyes.

Shay's story also connects to other games. Rogue takes place before Assassin's Creed III and overlaps in time with Assassin's Creed IV: Black Flag. Characters including Haytham Kenway and Achilles Davenport help link the North Atlantic narrative to the wider series.