Sir Hector Dragonsheart (Gallantmon X): One of the last two surviving Royal Knights. Often considered the heart and soul of the order, Sir Hector was among Lord Artorius's most trusted and powerful. After Artorius's failed attempt at controlling the Mikaboshi led to the destruction of the Royal Knights, Sir Hector led the surviving members in an attempt to stave off the Chaos, only to fail. After the Peacemakers triumphed, Sir Hector and Sir Percival the Magnamon retreated into isolation, seeking penance for their wrongdoings. They, in turn, were sought out by Mephistopheles, who needed to use them in part of the ritual to open the Inferno. Percival was killed, and Hector was captured.
Boss Lu Bu/Sir Fengxian (Gankoomon): Known as the "Lost Knight", Sir Fengxian was one of the original 13 Royal Knights before he and Artorius had a falling out centuries ago. He left the order, casting off his allegiance to them. Going by the name "Lu Bu," he spent several hundred years wandering the world, offering his hero-services to those in need, accepting pay from those able to pay him, and he carved himself a pleasant little life of adventure and happiness. He was sought out by Artorius at the start of the Crusade, but angrily rebuffed his former Lord. Lu Bu was saddened to hear of the order's demise, but unsurprised--knowing Artorius's ambitions as he did. When the demons rose, Lu Bu returned to the world at large, taking up the mantle of protector once more.