Titan

Titans (巨人 Kyojin?, lit. "Giant(s)") are a race of giant, man-eating humanoids that serve as the catalyst for the events in the series. The people inside the Walls were taught that they first appeared 107 years prior to year 850 and had rapidly exterminated humanity to the point of near-extinction.[1] In reality, they are transformed humans known as Subjects of Ymir, and have existed for nearly 2,000 years.

Titans strongly resemble nude humans. They are typically bipedal with the limbs and features one would expect in humans; however, they are all deformed to some extent in body proportions (enlarged head, small limbs, etc.). Many Titans have exceptionally wide mouths with an array of square teeth. The vast majority of Titans have a masculine body shape, although all of them lack reproductive organs.