Which Assassin's Creed game features Arno Dorian as its protagonist?

Assassin's Creed Unity features Arno Dorian as its protagonist.

Arno is a French Assassin whose story unfolds in Paris during the late eighteenth century. He joins the Brotherhood while investigating the murder of his adoptive father and becomes involved in the political and social upheaval surrounding the French Revolution.

Unity was released in 2014 and was designed around a detailed version of Paris. It introduced cooperative multiplayer missions in which players could work together as different Assassin characters. The game also expanded customization, allowing players to alter Arno's weapons, clothing and abilities.

Arno is distinct from the Frye twins, Jacob and Evie, who lead Assassin's Creed Syndicate in Victorian London. He is also separate from Élise de la Serre, a Templar and important character in Unity's story. The title “Unity” refers to the game, not to Arno's personal name or organization.