| The subject of this article is anonymous.|
The name used is an alias, nickname or surname found in an official source, but the actual in-universe name of this person is unknown in this continuity.
| The subject of this article uses an unofficial translation of the original Japanese name.|
The translation provided is as accurate as possible, but should not be considered official until appearing in an approved English source.
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. His resting face usually made his teeth visible. He was only ever seen wearing black pants and shoes, a white button up shirt, and sometimes a dark colored blazer.
Comrade D was a 3-4 meter class Titan and had a disproportionately big head and shoulder-length, messy, brown hair with brown eyes. Its body was relatively toned, and it always had an angered expression on its face.
In his human days, Comrade D was a member of the Restorationists. He was present when Grisha Jaeger found out about his sister's real cause of death at the hands of Marleyan soldiers and he cheered Grisha on as he went through the initiation ceremony of carving an "X" into their skin. For several years, he worked with the restorationists on their discovery of history and plan to bring Eldians back into power. He was present when Dina Fritz appeared before them as an ally sent by The Owl, their mole in the Marley Public Security. After learning of Eldia's true history and the Great Titan War, he cheered with his comrades when they agreed to take back the First King's power and give it to Dina, 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, he rallied with his comrades to decide their plan. They then discovered from The Owl that the Marleyan government only wanted to go to war so they could steal the fossil fuel below the island. Grisha offered his son, Zeke Jaeger, as a volunteer and mole for their organization. However, two years later all the restorationists were turned in by Zeke and sentenced to go to Utopia and spend the rest of their lives as Pure Titans that ate their own kind.
The Restorationists were all then taken on a steamboat to Paradis Island and forced to kneel on the edge of a large Wall. First, one of the restorationists was kicked off the Wall as a human and told to make a run for the Walls. After this, all the Restorationists, except Comrade D, Dina, and Grisha, were injected with Titan serum and kicked over the Wall. Moments later, they all turned into Titans and ran after Grice. After Dina was transformed, Sergeant Major Gross then decided that he would turn the last restorationist into a small Titan that would eat Grisha. After this, Comrade D was injected with a Titan serum and pushed over the Wall, turning into a Titan moments later.
Before Gross could push Grisha over the Wall, Kruger pushed the sergeant off the edge. He hit the ground and rolled on the sand-dune and found himself face to face with the former Comrade D. The Titan picked Gross up and took a bite out of his face, ripping a portion of his skin and muscles off before he continued to devour him.
During the battle for Trost District, this Titan happens to catch its arm on Mina Carolina's omni-directional mobility gear grapple wire mid-air, bringing her crashing against the Wall and then down to the ground, knocking her into a daze. The Titan spots her just before she gathers herself and then goes on to pick her up and bite most of her head off as she struggles, killing her as other cadets die around them.
It is seen once more afterward, having made its way with other smaller Titans into the equipment depot of the military headquarters in Trost. As part of Armin Arlelt's plan to clear out the Titans from the depot, Sasha Braus attacks it, but fails to land a killing blow. As the Titan approaches Sasha, Mikasa Ackermann comes to her rescue, killing the Titan.