As a knight, he's retained many knightly qualities from both the time before Megiddo possessed his body, and after he rejoined the Order. He has a strong sense of justice and honor, and is loyal to a horrible fault. He'll fight tooth and nail to fix a wrong needing to be righted, and would argue with anyone who seeks to prove him wrong, even those of higher rank. That, matched with his loyalty, makes him an exceptionally efficient follower, able to carry out his knightly duties without flaw.
However, away from his knighthood, to those he considers close friends, he's somewhat easy to push around. He seeks to please those he cares for in any way he can, often to the point of being forced into tasks he generally doesn't want to do, or walked all over in any sort of compromise or agreement. Otherwise, he's a rather carefree and easygoing individual, prone to big smiles and many amusing expressions. He loves to make others laugh, even though he's no good at jokes, and often finds ways to make his fellows happy even in the darkest of times.
However, crafting large objects - say a tall stone wall, comprised of thick layers of energy, to protect against some sort of attack - take a lot out of him, and drain his energy quickly. If he uses too much, he's very prone to an overtax, and can be weakened to the point of collapse in the middle of a battle. Though he's usually efficient enough to avoid such drastic measures, when protecting those weaker than himself, he often throws caution to the wind.
He wears two bangles on each forepaw and thick metal bands along his tail. Around his neck, Kacius wears the same dark amethyst pendant on a longer chain, glimmering the same color as his eyes. Each back paw is covered in thick, protective black leather gloves.
As a human, he has long, fluffy white hair drawn into a loose ponytail, bright, expressive purple eyes, and a high-cheekboned, regal face. He holds an air of innocence about him that Megiddo lacks, and actively displays whatever he feels upon his face. He retains all of the scars in his dragonform, and his eye scar that Megiddo shares is mirrored from the demon, on the left instead of the right. More often, he wears white tunics and silver cloaks, with light, elven armor and thin, light swords.
After being freed from Megiddo, his black-and-teal hair changed to pure, snowy white, and one of his scars flipped to the other side. His dragonform became lighter in color, and the teal coloration turned to a dark steel, with a white mane that had never been there before. He still retains his purple eyes, and his basic features, even after so many years being under Megiddo's influence.