A Deviant Titan is a Titan that appears in both the anime and manga. Deviant Titans are known to have a strange form of intelligence that other Titans do not possess. For this reason, their actions are often unpredictable and they can be especially devastating to humanity.
Deviant Titans posses a form of intelligence, making their actions very unpredictable. They will even go as far as to ignore humans in order to interfere with their strategies, and they often cause much more devastation than any other normal Titan.