Avi holds the title of Prince for the knight kingdom Arstoria, a realm within a dream world besieged by dream-consuming entities called "Yumekui." He journeys across this imperiled world with his butler, Navi, driven by a mission to save it. Their objective is to gather fellow princes whose combined strength offers the only counter to the existential threat. Avi's heritage intrinsically binds him to Arstoria's duties and the wider conflict endangering all dream-dependent realms.

His personality embodies the "Grumpy Responsible Guy" archetype, creating persistent friction with the more laid-back Prince Kiel, especially in combat and strategy. Avi greets the protagonist with initial skepticism, questioning her claimed identity as Princess of Traümere despite Navi's confirmation. Nevertheless, he pragmatically accepts her vital ability to awaken sealed princes from rings and empower them against Yumekui-possessed foes.

In combat, Avi engages possessed enemies directly, his powers amplified by the protagonist's royal support. These battles often necessitate coordination with other awakened princes, particularly Kiel, despite their contrasting methods. The urgent need to unite the scattered princes across diverse kingdoms forms the core of his ongoing quest.

Avi's relationships evolve primarily through interactions with the protagonist, Kiel, and Navi. While steadfastly maintaining his dutiful and serious nature, he gradually integrates into the group focused on locating the remaining sealed princes. His deep ties to Arstoria imply inherent combat prowess and leadership expectations befitting its knightly traditions.