Jacob Frye is the playable male protagonist among the Frye twins in Assassin's Creed Syndicate.
Jacob and his sister Evie Frye are Assassins who travel to London in 1868, during the Industrial Revolution. Jacob focuses on building the criminal Rooks gang and confronting Templar influence, while Evie often emphasizes investigation, stealth, and locating an important Piece of Eden.
Syndicate allows players to switch between the twins for much of the campaign, although some missions are assigned to a particular sibling. Jacob is generally the more impulsive and confrontational of the pair, while Evie is characterized as more methodical.
Henry Green, also known as Jayadeep Mir, is an Assassin ally in London, not one of the twins. Jack the Ripper is the central antagonist of a later downloadable story, not a Frye family member.