Ari is an elf and Luctiana's fiancé, harboring deep-seated prejudice against humans. He dismisses them as "savages," perceiving them as little better than animals driven by base instincts like fighting over food. This prejudice compels him to reluctantly join Luctiana's mission to capture Tiffania at the De Ornielle mansion, resulting in Saito's accidental kidnapping. Forced to flee elven territory with Saito and Tiffania, Ari travels alongside humans against his wishes.

During this journey, particularly at Tabitha's coronation in Gallia, Ari begins reassessing his views. A turning point occurs when he observes the relationship between Guiche and Montmorency, recognizing parallels to his own dynamic with Luctiana – including conflicts and accusations of infidelity. This leads him to acknowledge shared relational struggles between humans and elves. Ari and Guiche subsequently form a bond over their difficulties managing romantic relationships.

Ari demonstrates fierce protectiveness toward Luctiana, insisting Guiche search for her when safety concerns arise. Despite his love, he frequently opposes her actions, especially her fascination with humans, only conceding when she threatens to call off their marriage. His appearance includes pointed ears, light skin, turquoise eyes, and short light blonde hair with two long tied strands hanging before his shoulders.