Jacob Frye is one of the playable twin protagonists in Assassin's Creed Syndicate.
Released in 2015, Syndicate is set in London during the Industrial Revolution. Jacob and his twin sister, Evie Frye, are Assassins who arrive in the city and work to weaken Templar control over its criminal and industrial networks.
Jacob focuses heavily on direct combat, gang leadership, and taking territory, while Evie often emphasizes stealth, investigation, and locating an important Piece of Eden. Players can switch between the twins during much of the campaign.
Henry Green is an Assassin ally and mentor in London, not Jacob's twin. Shay Cormac belongs to Assassin's Creed Rogue, and Liam O'Brien is a character from the earlier Assassin's Creed III storyline.