Prior to his corruption, King Arthur was noted to be a wise, loyal and just ruler, as well as a honorable knight of great virtues. He also cared greatly for his kingdom and its inhabitants, having willingly saved it on countless occasions.

When he was bewitched by the Scabbard of Excalibur, Arthur's personality underwent a drastic change. Corrupted by power, Arthur became an evil and cruel tyrant, perfectly willing to enslave, terrorize and murder his own people, plunging his kingdom into horror and chaos without showing a hint of remorse.

As the Black Knight, King Arthur was incredibly arrogant. Confident in his own superiority, Arthur viewed those beneath him as weaklings and not worth his time. As a result, Arthur took a very limited interest in the subject he was presented with to the point where consider whether or not he should participate, and could even withdraw from a battle with opponents he deemed unworthy on a whim.

Arthur is voiced by Gavin Hammon, his acting can be found here: https://youtu.be/qra_prvwKIQ?t=192