The Colossal Titan (超大型巨人 Chō ōgata Kyojin?) is an evidently intelligent Titan and humanity's greatest threat. It first appeared five years ago during the fall of Wall Maria and returned five years later at Trost.
The Colossal Titan possesses a very distinctive appearance and a number of unusual features. It grew to roughly 60 meters tall, making it around four times the height of any other Titan seen thus far.
The Colossal Titan is one of the more heavily-deformed Titans seen in the series - it appears to lack skin entirely and its jaw and facial structure seems to be heavily altered from the human form. It is also constantly releasing jets of steam from the surface of its body. Its feet are also quite different to those of a human and other Titans, as they are swollen and pillar-like in appearance. Its physiology is modeled after the male sex, but like all Titans, it lacks sexual organs. It has slim arms in comparison to its body and legs.
The Colossal Titan makes its first appearance outside Wall Maria, terrorizing the population of Shiganshina and kicking a hole in the gate. Its actions allow the normal Titans dwelling outside to enter Shiganshina and eat many of its inhabitants, including Carla Jaeger.
The Colossal Titan reappears five years later in 850, breaching Wall Rose so that its brethren can once again devour the humans inside. It is almost immediately attacked by Eren Jaeger, but it first repels and blinds him with vapor from his high-temperature body before vanishing completely from view. This attack prompts the Garrison to create the Colossal Titan contingency plan for Trost District.