Marcel Galliard

Berik was a comrade and childhood friend of Reiner Braun and Bertolt Hoover. Little is known about him, other than the fact he sacrificed his life to protect Reiner and was devoured by Ymir in her Titan form. It is known that he died somewhere outside Wall Maria prior to it being destroyed, suggesting he may have been one of the Titan Shifters on a mission to attack and infiltrate the Walls. This is, however, unconfirmed.

Story
When a group of Titans were attacking a tower in Castle Utgard, Ymir transformed into a Titan to fight them. Reiner and Bertolt recognize Ymir's Titan form to be the same one that ate their childhood friend Berik.

Later, in the Forest of Giant Trees, Bertolt asks Ymir if she remembers eating their friend. However, Ymir replies that she doesn't remember.