Rivar, president of the startup Cyedge, sports long sea-green hair, purple eyes, and a black outfit featuring a distinctive arms-length gauntlet on his left arm. He defines himself through arrogance and pretentiousness, frequently erupting into emotional outbursts, especially during encounters with Akari from rival Kibou Company. These intense reactions stem from an unrequited rivalry heavily implied to originate from romantic feelings for her.

Representing Cyedge alongside his secretary Valmi in a young adventurers' contest, Rivar competes directly against Kibou. His team faces significant difficulties navigating the dungeon and struggles against the three-headed maju boss, ultimately requiring unexpected assistance from the Kibou group to overcome the threat. This highlights his tendency toward overconfidence despite acknowledged adventuring skills.

Later, Rivar sustains serious injuries during a separate incident involving powerful majus within the city's underground area. This event prompts Kibou Company members to visit Cyedge and gather critical information from him about these dangerous creatures, demonstrating his firsthand experience with high-level threats. His role consistently positions him as a rival figure, his competitive drive and personal frustrations toward Akari fueling recurring conflicts throughout the series.