Ari is an elf, fiancé to Luctiana. He possesses the typical elven traits: light skin, turquoise eyes, pointed ears, and short light blonde hair featuring two long strands tied and draped over his shoulders. He initially holds strong prejudices against humans, consistently calling them "savages" and viewing their conflicts as trivial disputes over resources like food.

His background includes a mission with Luctiana to capture Tiffania at the De Ornielle mansion, where they also end up kidnapping Saito. After escaping elven territory with Saito and Tiffania, Ari reluctantly travels with the humans. A shift in his perspective begins during Tabitha's coronation in Gallia, where he observes human interactions and starts recognizing similarities between elves and humans.

A pivotal moment occurs when Ari witnesses an argument between Guiche and Montmorency over Guiche's infidelity. This resonates deeply with him, mirroring his own struggles with Luctiana. He remarks to Guiche that both elves and humans share the common challenge of understanding and appeasing their partners. This realization fosters a bond between Ari and Guiche as they commiserate over their relationship troubles.

Despite his growing tolerance, Ari remains fiercely protective of Luctiana, demanding Guiche ensure her safety. However, their relationship is marked by frequent disagreements, particularly over her fascination with humans. Ari disapproves of her interest in what he still considers "savages," though he often acquiesces to her demands when she threatens to cancel their marriage.