Gyges was one of the guards posted at the main entrance of Tartarus, working the gate alongside his brother Briareos. When All For One's assault reached the Bronze Gate, he lost his brother in the opening exchange, called the code red that warned the prison, and was killed moments later.
Six arms extended from a lanky frame. The defining piece of his gear was a helmet that sealed his face away completely, fitted with a pair of horns.
Little of him is on record beyond his commitment to the job. Once he understood what All For One and the Nomu meant for the prison, his response was to raise the alarm.
Gyges and his brother Briareos were holding the Bronze Gate, the mainland entrance to Tartarus, when Tomura Shigaraki, under All For One's control, arrived with his Near High-End Nomu. The brothers turned the prison's security robots on the attackers to drive them back, and Briareos was killed during that first confrontation. When the guards inside called for a report, Gyges relayed the death and triggered a full lockdown at code red. Finding the entire episode tiresome, All For One reached for his Quirk and blew apart the span of bridge under Gyges' feet, then carried on into the prison.
His Quirk was never named. It appears to be the source of the six arms, though whether they retract or are a permanent part of his body was never clarified, and the effect resembles Mezo Shoji's Dupli-Arms.

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Gyges is one of the guards posted at Tartarus prison's Bronze Gate, working alongside his brother Briareos to defend the mainland entrance.
Gyges has an unnamed Quirk that gives him six arms, an effect similar to Mezo Shoji's Dupli-Arms.
Gyges was killed by All For One, who blew apart the bridge beneath his feet at the Bronze Gate after Gyges raised the prison's code red alarm.
Gyges' brother Briareos was killed in the opening clash with Tomura Shigaraki's Near High-End Nomu when All For One's forces attacked Tartarus' Bronze Gate.
When Tomura Shigaraki, under All For One's control, attacked the Bronze Gate with a Near High-End Nomu, Gyges turned the prison's security robots on the attackers and relayed his brother's death, triggering a full code red lockdown.
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