“How long will you remain the protected? The king entrusted the role of protector to you.”
“Head of the Crownsguard and widely regarded as one of the three most powerful warriors in the Kingdom of Lucis. His unfailing ability to return from the brink of death has earned him the nickname “Cor the Immortal”—an appellation he particularly dislikes. On the eve of the signing ceremony, Regis tasked Cor with evacuating the citizens ahead of the imperial assault, knowing he could trust the marshal implicitly. After fleeing the ruins of Insomnia, he seeks out Noctis to share with him his late father’s dying wishes.
Cor holds the distinct honor of having served three separate Lucian monarchs: Mors, Regis, and Noctis. While his loyalty to his lieges has never wavered, his attitude toward authority has evolved over the years. In the arrogance of his youth, he publicly criticized Regis’s retreat from Accordo in the Great War, calling the then-crown prince and his men “a bunch of cowards.” While Cor’s Crownsguard colleagues were incensed by this show of impertinence, Regis was impressed with the young firebrand’s willingness to speak truth to power and immediately hired him as a personal bodyguard. The marshal was so touched by this show of grace that he swore to devote his life to serving Regis and his son Noctis.”
-Dossier Entry
Cor, the Immortal.
Commander of the Crownsguard.
Leader of the Kingslaive.
The personal bodyguard of the late King Mors, who went on to be the personal bodyguard of the late King Regis as well. He isn’t Noctis’s bodyguard, but he still serves him. Cor has served the Royal family for 3 generations. Which makes his story a pretty big one, but since I haven’t finished FFXV, I really can’t get into that.
All I can tell you is that Cor helps Noctis escape from Insomnia, and that even though he butts heads with Ignis, he still watches over Noctis and his party. Cor is the one to tell Noctis that he must collect the weapons of the late Kings.