As described by Roland, Argalia is a "certified lunatic" whose attitude and actions are unpredictable, having "lost it" after the death of his sister Angelica. He is highly charismatic, always appearing to be calm, amicable, and soft-spoken, easily manipulating opponents and swaying potential allies to his side. When he holds the advantage, he openly mocks his victims and opponents in the same playful manner, only rarely revealing his actual cold and callous attitude towards them. Argalia cares a lot for his sister and regards her with love; his plan to seize the Library's Light is motivated by his desire to come to terms with Angelica's death. At the same time, he also views Angelica's husband as a violent brute who took her away from him undeservingly from the very start of their marriage.
Charismatic and polite
Not much is known about Argalia's past, other than the fact he and his sister Angelica were a part of experiments before escaping. After his sister's death by The Pianist, he went insane and began to hear the Voice, prompting him to free the world from "loneliness".
