Roan

The main protagonist, Roan is a swordsman whose main goal in the anime is to gain power to protect his childhood friend, Yufa. At one point, he believes he has failed in this and goes off alone to get stronger. After a fateful encounter in Byalan, Roan returns to the group as a Crusader, successfully rescuing Yufa; however, as the story progresses, Roan begins to lose sight of his duty.

(Source: Wikipedia)