Bertholdt

He then laments that he could not have more time with his half-brother and that he can't save his comrade Bertholdt as Levi wrecks the party, looking to finish the war once and for all.

Reiner and Bertholdt have been deep undercover, developing genuine friendships with their victims.

With Bertholdt being captured by the Survey Corps, Eren and the rest of the crew come to the decision that his power should be transferred to their dying friend, Armin, who had been burned by the Colossal Titan's steam based attack.