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 its class. It exhibited little intelligence, appeared to feel no pain, and ignored a spear driven into its heart because it had a chance to eat Hange. It lost activity after an hour of sunlight deprivation.

Hange described its personality as "introverted".

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