Lieutenant Colonel Fayer is a minor antagonist in the anime series Code Geass: Lelouch of the Rebellion, serving as an officer within the army of the Holy Britannian Empire. He is first introduced as the military commander stationed at Shikine Island. His character is defined by his dedication to military protocol and the aggressive expansionist policies of Britannia, acting as an obstacle to the series' protagonist, Lelouch vi Britannia, and his alter ego, Zero.

In terms of his background and role, Fayer holds the rank of Lieutenant Colonel and is placed in charge of the strategic location of Shikine Island. He is depicted as a middle-ranking officer who rigidly follows the Britannian military's doctrine, which prioritizes victory and the elimination of enemy threats at any cost, including the sacrifice of one's own soldiers. His appearance is that of a standard Britannian military man, with brown hair cut to ear length and gray eyes.

Fayer's personality is best illustrated through his actions during a key confrontation between the experimental Britannian Knightmare, the Lancelot piloted by Suzaku Kururugi, and the resistance group known as the Black Knights. During this incident on Shikine Island, he instructs Suzaku to engage and restrain the resistance leader Zero, fully aware that the area is about to be bombarded by friendly fire. He orders Suzaku to sacrifice his own life in the attack, demonstrating a cold and pragmatic view of soldiers as expendable assets necessary to achieve a strategic objective. When Suzaku, driven by a subconscious Geass command to live, survives and disobeys orders to retreat, Fayer is outraged. He immediately orders Suzaku's arrest, viewing his insubordination as the failure to secure a golden opportunity to capture Zero, even though his own plan would have resulted in a loyal pilot's death. This highlights his unwavering commitment to the chain of command and a results-oriented mindset, with little regard for individual heroism or personal bonds.

Fayer's role in the story evolves from an active minor threat to a pawn in Lelouch's larger schemes. His key relationships are primarily functional and antagonistic. He is a direct superior to Suzaku Kururugi, and his harsh treatment of the pilot creates conflict. He also serves under higher-ranking officers, such as Monica Kruszewski, the Knight of Twelve, as seen when he is stationed aboard her flagship, the "Great Britannia".

The character's most significant development occurs not through personal growth but through his subjugation. In the second season, Fayer returns as part of a military reinforcement. However, he is quickly neutralized by Lelouch, who uses his Geass power on other soldiers to restrain Fayer. Lelouch then issues a direct command: "From this moment forward, you shall obey my orders". This event marks the end of Fayer's independent agency. He later appears inside a gun turret on a Britannian battleship, where he has killed a soldier and begins attacking the Emperor's Royal Guards, having been turned into an unwilling instrument of Lelouch's plan to infiltrate the Imperial family's compound. This transformation from a loyal officer enforcing Britannian will to a mind-controlled soldier attacking his own leaders perfectly encapsulates the series' theme of power and control.

As a minor supporting antagonist, Fayer possesses no special abilities or exceptional skills that distinguish him from the average Britannian officer. His importance is derived from his position and the actions he takes within a specific part of the narrative, serving as an early representative of the Britannian military's brutal pragmatism and later as a direct demonstration of the absolute power Lelouch's Geass can exert over his enemies. He has no known family background, personal motivations beyond his military duty, or significant emotional development throughout the series.