Riku is calm, reserved, and almost stoic — he rarely raises his voice, and when he speaks, it’s usually in short, thoughtful sentences. His demeanor can feel cold and distant, but beneath that icy exterior is a surprisingly empathetic heart. He believes beauty lies in fragility, and he approaches both art and people with a quiet reverence. However, his fatal flaw is his obsession with impermanence: he struggles to accept permanence or change, clinging too tightly to fleeting moments.