Alexius Mu

Japanese name:

ムー・アレキウス

Captain of Reim's "Fanalis Corps", considered the greatest warrior in all the Empire. He is one of the Empire's three Dungeon Capturers. Like his sister, he is only half-Fanalis, being more weak physically than his pureblood companions. Mu and his companions lead the attack on Magnostadt, easily breaking through its defenses until being stopped and repelled by Aladdin and Alibaba.

Wikipedia