Marcel Galliard was the older brother of Porco Galliard, comrade and childhood friend of Reiner Braun, Bertolt Hoover, Annie Leonhart and Pieck Finger. He was part of the group of Warriors sent by Marley to attack the Eldians of Paradis Island in year 845, but his mission was cut short by the sudden appearance of Ymir, as a Pure Titan. He possessed the ability to transform into the Jaw Titan.
Marcel had short dark hair swept back and an upturned nose. On the mission to breach Wall Maria, he dressed in a long jacket with a backpack likely filled with supplies for the long journey away from their hometown.
Marcel was described by his brother as a strong and reliable person. He also demonstrated his friendly personality through his interactions with his fellow Warriors, particularly Reiner, always giving them encouragement. He also appeared to be selfless, sacrificing his life to save his friend Reiner from being eaten by a Titan. He greatly cared for his fellow Warriors and his brother, so much that he attempted to protect Porco from inheriting the Armored Titan. Unlike the other Warriors who saw inheriting one of the Nine Titans as a symbol of pride, Marcel saw it as a tragic fate, and ultimately unsuccessfully tried to stop his brother from succumbing to the same fate.
Appearance: Marcel had short dark hair swept back and an upturned nose. On the mission to breach Wall Maria, he dressed in a long jacket with a backpack likely filled with supplies for the long journey away from their hometown.
Personality: Marcel was described by his brother as a strong and reliable person. He also demonstrated his friendly personality through his interactions with his fellow Warriors, particularly Reiner, always giving them encouragement.
History: Marcel Galliard was an Eldian born in Marley. At some point in his youth, his parents sent him and his brother Porco into training to become Warriors for Marley.
Marcel Galliard in the story: After traveling through the night, the Warriors camp until sunrise. At this time, Marcel reveals to Reiner that he was not meant to inherit the power of the Titans, and he apologizes for putting his brother's life over Reiner's. Unfortunately, before the matter can be discussed further, a Titan rises up out of the ground and attacks Reiner.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.