Abnormal (Anime)

An "Abnormal" (奇行種) is an uncommon type of Titan which can possess unusual intelligence or perform unpredictable actions.

Description
Unlike the typical Titan which attacks and devours humans on sight, abnormal Titans may choose to ignore lone or isolated humans and exhibit unpredictable behavior; often resulting in them causing larger damage as they disrupt important strategic locations. Some of these uncommon behaviors are speed-walking or running, performing great jumps, and even speaking human language.

Ilse's Notebook: Record of a Fallen Soldier
During the 49th expedition outside the Walls, Hange Zoë among other members of Levi's squad encounter an abnormal Titan that, after chasing Hange, suddenly turns around and heads back into the forest. Hange follows it deep into the forest and it stops within a field. After a brief delay, it begins banging its head of a tree within the centre of the field. Hange and company get off their horses and tries to ask it what is its purpose is but is interrupted when it swings at them. After using their omni-directional mobility gear to escape to a tree, they again come down to the ground and try to talk to it before Oruo attempts to kill it. When Hange pleas him to stop he becomes distracted and is captured and almost eaten before Levi appears and cuts off its arm and then kills it. After Levi expresses his outrage towards Hange's incompetence for her team mates safety, Petra shockingly points out a decapitated corpse hidden within a hole in the tree. They then find a lost diary on the ground that belonged to Ilse Langnar before her death.

Hange reads the diary. It explains that after Ilse's entire flank was massacred, she fled to a nearby forest, heading north. After profuse running, she inadvertently runs into a Titan and writes in the diary, believing it to be her end. She remarks that instead of immediately eating her, it hesitates. It then addresses her, saying "Ymir's people" and "Ymir-sama", greeting her with deep respect, and bows. She is thoroughly confused that the Titan can form speech, and writes in her diary that she has attempted communication. She first questions it about what the Titans are, and building up blind sadness, fear and rage, she angrily yells why Titans eat humans and what their objective is. The Titan appears more and more frustrated as it moans and tears at its cheeks, ripping off flesh and spraying blood. Ilse attempts to flee but is caught by the Titan, who is rapidly crushing her skull, and Ilse writes down her last few notes about the experience before being decapitated. The Titan later stores her corpse in the tree. Nothing is known about the Titan's motive and actions, but Ilse's notes prove significantly useful to humanity.

The Struggle for Trost arc
After the breach caused by the Colossal Titan and subsequent invasion of Shiganshina District, a horde of Titans entered through the destroyed gate. They are notable for entering the district almost immediately after the breach, and it is theorized by Armin that they were somehow lured in.

As Eren Jaeger's group was heading towards the middle guard in the Trost District, an abnormal Titan jumped out of nowhere and grabbed Thomas Wagner in its mouth. The rest of the group looked on, horrified, as the Titan swallowed him whole. The same Titan would later appear, where it would be killed by Eren in his Titan form.

Another abnormal Titan appeared and charged straight towards the rear exit of Trost, where a group of citizens were gathered and trying to escape. It ran so fast that the elite guards stationed in that area could not keep up with it. Mikasa Ackermann appeared and sliced the nape of its neck to kill it, dulling her blades in the process.

The 57th Exterior Scouting Mission arc
The Scout Regiment went on its expedition outside Wall Rose and on the way, an abnormal suddenly appeared towards the right flank. It completely ignored the soldiers at the outer guard and charged straight towards the center of the formation. Armin Arlelt watched as Luke Cis and Dieter Ness attempted to kill it, cutting the tendons of its foot and making it fall, and successfully killing it. There is also an abnormal Titan which walks and runs on all fours and is capable of running at very high speeds. Its limbs are deformed giving it a spider-like gait and it is subdued by a team leader who leads it into a tree, knocking it unconscious.

Trivia

 * Intelligent Titans are considered to be abnormal Titans, but are classified differently.

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