Nikolaos is the adoptive father of the Spartan protagonist in Assassin's Creed Odyssey.
Nikolaos, known as the Wolf of Sparta, raises the protagonist in the family of Myrrine and serves as a respected Spartan general. A traumatic childhood event leads to the protagonist being cast out from Sparta, creating the exile that begins the game's story.
Odyssey allows the player to choose Kassandra or Alexios as the playable character. Regardless of that choice, Nikolaos remains a central figure in the family storyline. The game later reveals important facts about the family's history and the political pressures surrounding Sparta during the Peloponnesian War.
Nikolaos is based on the Greek name Nikolaos, while the historical Spartan king Leonidas I is a separate figure who appears in the game's opening and ancestral storyline. Odyssey was released in 2018 and is set in the fifth century BCE, decades before the events of Assassin's Creed Origins.