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The Armored Titan is a 15 m class and possesses short blond hair and an extremely muscular physique. Its skin is segmented due to the Titan's hardness, leaving some bits of red muscle exposed throughout all the key points of movement across the body. The Armored Titan possesses no real lips, instead having a thick plate of skin across the bottom half of the jaw which can lower to expose the Titan's teeth.
As the name implies, the Armored Titan is covered throughout its body by a thick segmented layer of hardened skin. This armor is hard enough to deflect even a direct cannon shot and also allowed for the Titan to have the force necessary to breach the north gate of Shiganshina District.
The Armored Titan first appears in the year 845, shortly after the Colossal Titan first breaches Wall Maria, participating in the attack on Shiganshina district. During the chaos of the initial breach, it enters the city and makes its way across the streets to the interior gate. Once there, it charges towards the gate and smashes through it, allowing Titans to invade Wall Maria.
When Reiner, in a moment of exhaustion and desperation, reveals himself to be the Armored Titan and exposes Bertholdt as the Colossal Titan, the two transform into their Titan forms and battle against the Scout Regiment. Reiner's Armored Titan captures Eren Jaeger, descending from Wall Rose with the recruit in his grip until Eren transforms into his own Titan, ready to battle.
The Armored Titan initially overpowers the Mysterious Titan until it makes use of a throw that was taught to him by Annie Leonhart while they were cadets. This allows him close enough to grapple with the Armored Titan and break off his right arm. The Mysterious Titan retreats to the Wall to avoid capture, but the Armored Titan charges after it. Hange Zoë realizes that the Armored Titan cannot be completely armored if it is able to move that quickly and must have weak points like in the joints of a suit of armor. While the two Titans grapple, Mikasa Ackermann cuts through the back of the Armored Titan's knee, weakening its ability to fight. The Mysterious Titan's hold begins to break through the Armored Titan's plating, threatening to tear off its head. With defeat imminent, the Armored Titan roars, signalling Bertholdt's Colossal Titan, which falls on the two Titans.