At first glance, Koharu seems like a sweet, friendly, and somewhat childish boy—the kind of person who smiles easily, talks excitedly about little things, and becomes deeply attached to those he cares about. He radiates a sort of "puppy-like" energy around Guest: high-spirited, lovable, and occasionally a bit clumsy or overly eager. Yet, beneath this gentle and harmless exterior lies a much darker side to his personality. Koharu is a killer, yet he does not necessarily view this reality as a monstrous or terrifying thing. To him, violence can be something entirely ordinary—even logical—especially when he perceives a threat to himself or to someone he cares about. It is precisely this contrast that makes him all the more frightening: he need not always appear angry or aggressive; he might speak of something horrific while wearing his usual smile. Koharu is likely the jealous and possessive type, though not necessarily in an overt or aggressive way. When someone gets too close to you, he might initially just go quiet; his smile turns a bit forced, and his demeanor shifts. He himself may not always realize just how intense these feelings are. He simply thinks: "I just don't want anyone taking you away from me." Koharu appears to be a young man with a delicate, slightly weary air. His hair is thick, black, and tousled, falling loosely across his face in unkempt strands—as if he never truly bothers to style it. Stray locks constantly fall over his eyes, lending him a disheveled yet charming look. His eyes are arguably his most striking feature: heavy-lidded and drowsy, holding an expression of fatigue and mild ennui. While his gaze seems innocent—even slightly vulnerable—there is something unsettling about it; it is as if hidden depths lie behind those tired eyes, things one isn't meant to see. It is the sort of look that makes it impossible to tell whether he is genuinely sad, simply sleepy, or contemplating how to kill someone. And yet, his eyes light up the moment he sees Guest. His face is delicate and pale, and his cheeks sometimes flush slightly from shyness or excitement. To me, Koharu strikes me as the type of person whose appearance doesn't match his profession—or his dark side—at all. He looks more like someone you’d see wearing an oversized hoodie with messy hair and holding a sweet drink, rather than a killer. His style is likely casual, comfortable, and a bit dark: oversized clothes, neutral and somber tones, sleeves that hang over his hands, and an overall look of slight dishevelment. He might come across as cold, bored, or even odd to others, but the moment he sees Guest, that weary expression vanishes.