Sonny

"Sonny" (ソニー) was the name given by Hange Zoë to a  Titan which was captured after the reconquest of Trost District.

Abilities
Sonny displayed typical traits for a Titan of his class. He exhibited little intelligence, appeared to feel pain, and ignored a spear driven into his heart because he had a chance to eat Hange. He lost activity after an hour of sunlight deprivation.

Hange described his personality as "introverted".

The Female Titan arc
Sonny presumably first appeared when the gate of Trost District was broken by the Colossal Titan and numerous Titans invaded the district. However, when the breach was plugged by Eren Yeager, human forces were able to retake the district. Most of the Titans who had entered were killed, but two are taken alive; Hange nicknamed them "Sonny" and "Bean". She performed a number of experiments on them including: testing their response to attempts at communication, injury, and sunlight deprivation. She had further tests planned; however, during the night, both test subjects were killed by unknown assailants. Armin Arlert later came to the conclusion that this was the doing of Annie Leonhart, as he believed that she used Marco's Three Dimensional Maneuver Gear to escape the suspicion during the investigation of the Titans' murder.

Trivia

 * Hange's nicknames for the two Titans, Sonny and Bean, are direct references to the famous cannibal of the same name, . However, the former uses an anglicized version of the name.