The protagonist of Assassin’s Creed Unity is Arno Dorian.
Arno is an Assassin active in Paris during the French Revolution. After the death of his adoptive father, François de la Serre, he is drawn into the Assassin–Templar conflict and eventually joins the Brotherhood. His personal connection to Élise de la Serre gives the political story an additional family dimension.
Unity begins in 1776 and reaches the revolutionary period beginning in 1789. The game recreates Paris with major landmarks such as Notre-Dame, the Louvre, and the Bastille represented within its open-world setting.
Élise is a major character, but she is a Templar rather than the playable protagonist. Germain is another important figure in the plot. Unity was released in 2014 and introduced cooperative missions that allow multiple players to work together as Assassins.