Rampage

Rampage [formerly known as the Crystal Titan] was a Titan that broke free of King Titan's control during the events of Extinction. This Titan joined the human resistance to fight his former master who manipulated his kind to universal domination.

Trivia

 * Rampage is a creature part of GodzillARK.
 * In the fanfiction, he is King Titan's size.
 * After the death of King Titan, he became the new ruler of the Titans.