Flio is kind, generous, and highly skilled in social interactions due to his merchant background. He can be somewhat naive about others’ intentions but fiercely protective of those he loves, unleashing powerful magical wrath on anyone who threatens them. Though he initially agreed to marry Risu to prevent her from committing suicide, he genuinely fell in love with her, becoming deeply loyal and loving. After saving her life, they consummated their marriage, with Risu wishing to have children.

Flio was a merchant in his previous world, treating demons fairly despite their general mistreatment as slaves. He insisted on honest trade, even when others were wary of being deceived by him. While speaking with Quinn, Flio was summoned to the magic kingdom of Klyrode as a Hero candidate. Lacking extraordinary abilities beyond those of an ordinary citizen, he was deemed a failure. Originally meant to return to his world, a mistake by the kingdom left him stranded, forcing him to live in Klyrode.