Attack on Titan

Titan Shifters are specific humans in possession of the "Titan's power", which allows them to transform into Titans. Unlike regular Titans, they are able to control their regular form and retain their human intelligence. It is often noted that Shifters are far more powerful than regular Titans and sometimes display abilities unique only to them. To transform, they must suffer an injury that draws blood while having a solid goal or belief in mind at the moment of injury. However, being injured by another person is also sufficient. Once the transformation is initiated, a yellow bolt of lightning appears to strike down the Shifter from the sky, followed by the generation of the Titan body and a release of steam. After transformation, their human bodies appear to be in the Titan's nape of the neck, where they control their Titan bodies. Their human bodies are also merged with the Titan's flesh inside, rendering them immobile. It is also visible that their eyes are connected within the body of the Titan, presumably for optic vision outside the body. An average height among the Titan forms is 15 meters, but this can vary, as shown by the Colossal Titan, the tallest known Shifter, is 60 meters, the Beast Titan is 17 meters, the Female Titan is 14 meters, and Ymir's form is 6-7 meters. If a Shifter's Titan form is pushed to its limit, its human form will emerge from the nape of its neck in a semi-conscious state. This is demonstrated separately by Eren, Ymir, and Annie when their Titan forms suffer defeat. But if a Shifter's Titan form is not exhausted, then its human form can partially emerge from the Titan form in full consciousness.