Kosetsu Urabe

Urabe Kosetsu, is a male member of the Four Holy Swords with blue hair, he appears to trust in Zero more than his teammates. He is one of the few top officers of the Black Knights not captured by Britannia after the Black Rebellion, as well as the first member to discover Zero's identity. He is killed by sacrificing himself by stabbing his sword through his own knightmare trying to destroy Rolo's Vincent in the battle of Babel Tower to allow Zero (as well as Kallen, C.C. and others) to escape.