Marcel Galliard

Berik was Reiner's and Bertholdt's childhood friend. He was eaten by Ymir's Titan form, after pushing Reiner to safety. He died in 845, and it is unknown whether he was meant to have a role in the attack on humanity or not. It is also unknown whether he possessed the same Titan Shifting ability as his friends.

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

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