Uri serves as the boar spirit representative and the twelfth member of the Eto Rangers, designated number 12 after finishing last in the Zodiac race determining team membership. As the only child among the Rangers, he initially exhibits distinct childish tendencies, including frequent crying when frightened or overwhelmed. This emotional distress activates his primary combat ability, the "Whee Blast," where his chest-mounted Ranger badge unleashes a powerful, uncontrolled destructive beam in random directions.

Despite a pampered upbringing, Uri secretly experiences loneliness and feelings of exclusion. His character undergoes significant development throughout the series. Beginning as a fearful crybaby whose powers activate involuntarily during missions, he gradually demonstrates increased resilience. By the final battle, he actively participates with bravery and survives without succumbing to tears.

Within team dynamics, Uri often forms temporary bonds during missions. He pretends Tart is his mother to manipulate a situation in the Straw Millionaire story. He also develops a genuine, though ultimately erased, friendship with a corrupted version of Little Red Riding Hood, sharing playful moments before the world's restoration. His youth and vulnerability sometimes position him as an Action Survivor, notably during the climax where he avoids fatal consequences by strategically positioning himself behind others during a destructive explosion.

Mission participation follows a roulette selection system determining which Rangers enter each Novel World. Uri is not chosen for every mission, but when selected, he contributes despite his limitations. His power, while destructive, remains unreliable due to its emotional trigger and random targeting, though it ironically aids the team at critical moments.