Jacob Frye is the London-based Assassin's Creed Syndicate protagonist who leads the Rooks.
Assassin's Creed Syndicate, released in 2015, follows twins Jacob and Evie Frye in Victorian London. Jacob is the more openly aggressive and gang-focused of the two, while Evie is generally associated with stealth, investigation and the search for Pieces of Eden.
Jacob forms the Rooks, a street gang that opposes the Templars' influence and the rival Blighters. The gang helps the Frye twins reclaim London districts from organized crime and Templar control.
Evie Frye is also a playable protagonist, so “the protagonist” can be ambiguous if the question does not identify Jacob's role. Henry Green is an Assassin ally and the son of the Indian Assassin Arbaaz Mir, while Maxwell Roth leads the Blighters before becoming connected to Jacob's story.