Comrade D was a former Restorationist who was captured by the Marleyan Public Security and turned into a Titan for the crime of treason.
Appearance: In human form, this restorationist was of average build and height. He had shaggy brown hair and large brown eyes. His face had very pronounced, tense features and lines; his eyes and eyebrows were almost always tensed and squinting slightly.
History: Comrade D was a member of the Restorationists prior to Grisha's joining them. After learning of Eldia's true history and the Great Titan War, the restorationists decided to take back the First King's power and give it to Dina Fritz, the last of the royal family. When the Marleyan government decided to select Eldian children as Warriors to take down the King on Paradis Island Grisha offered his son Zeke as a volunteer and mole for their organization.
Story: During the battle for Trost District, Comrade D catches his arm on Mina Carolina's omni-directional mobility gear grapple wire, causing her to crash. He then eats her before she can recover. Comrade D is one of several Titans which make their way into the equipment depot of the military headquarters in Trost.
Source: Comrade D (Anime), available under CC BY-SA 3.0.