One of the most intriguing aspects of Attack on Titan is the enigmatic talking Titan, a deviation from the usual mindless flesh-eating beasts that wreak havoc. Only one Titan has been shown to speak, encountering Ilse Langnar in the forest before killing her. Creator Hajime Isayama explained that this talking Titan was a "defective item" or a "glitch" that defied the norm of Titans being unable to communicate. This anomaly, along with Titan shifters who can change forms and possess unique skills, adds layers of complexity to the Titan world. The mystery surrounding Titans and their origins adds depth to the action-packed series as characters uncover the secrets behind these formidable creatures. Attack on Titan follows Eren Yeager and his comrades as they battle against the Titan threat in a world where humanity lives in walled cities to protect themselves from the Titans outside.