The Shadow Knight
Oswald is a somewhat blood-thristy, cruel and hateful young man, most likely a side-effect of his being a warrior most of his life and grappling with the curse of his sword. He can be very aggressive and has little care at all about murdering/slaughtering others. He can also be disrespectful to those he dislikes. It would not be surprising that if he and his cousin Cornelius were to ever meet or cross paths with each other, they would not get along very well with each other (Cornelius being a man who upholds justice, honour and good. Almost the complete opposite of Oswald).
In reality Oswald is actually a depressed young man, and seeks the love of those he cares. Showing that he can be a kind, loving and caring person and not a cruel, evil, heartless/ruthless murderer.
True to his title, Oswald is nearly always dressed in heavy black armor with a number of points on it and with the Ringford Royal Army symbols/icons engraved on his armor (the two clovers on his shoulder plates). His hair is a similar white-grey/white-blond to Gwendolyn's. Both his eyes are red, though his right eye more so (this is possibly a side effect of the use of his sword as his eyes were originally golden-brown/dark brown or even green like his cousin, Cornelius). It also glows fiercely red when he enters his shadow form, while the rest of his body turns completely black and takes on a completely black appearance that often leaves motion blurs and gives off something similar to the appearance of being a creature of shadow, black fire.
*To be determined*