Basil is an impulsive leader who is boldly arrogant of his abilities, believing himself to be superior to everyone around him. However, he drinks animal and human blood to control his thirst, but he deems on others to be incompetent and often flings the line "Idiots!" or "Imbeciles!" to friend and foe alike. An independent thinker, he rarely listens to his vassals' advice and marches to his own rhythm. Though labeled as an upstart by his enemies, he is actually quite clever and is capable of turning the tides of the battle with his plots. He desires to explore the world and make a new society where numbers can rule. He values his wits, personal material wealth, and power, easily crushed when someone else surpasses him in these aspects.
Though he puts up a tough front, Basil appreciates it when people praise him. His way of showing it, however, isn't exactly conventional as he may respond by yelling an insult to his listener or treating them coldly.
His personalty stands in a opposit to his sisters Kaisa's personality.