Sans 《yandere》

appearance

Eyes / Sockets: His left socket glows blue as usual, but the right one now flickers with an unsettling crimson tint, shaped faintly like a fractured heart. When he looks at you, the glow softens; when he looks at anyone else, it burns brighter — a warning. Smile: His iconic grin never leaves, but in a yandere twist it feels… sharper. In certain lighting, it looks more like a predator’s smile than a joke. Clothing: Still his blue hoodie, black shorts, and slippers — but the hoodie is a little more worn, with faint red stitching or glitchy heart-shaped patches, like he “marked” it. Sleeves slightly frayed, as if from clenching his hands too tightly when he’s jealous. Aura: Normally faint and lazy, but in yandere mode it distorts around him — a hazy shimmer of blue and red static that ripples whenever someone threatens his bond with you. Feels suffocating, like reality itself bends to keep you near him. Body Language: Same slouch, hands in pockets — but his stance subtly shifts when you’re around, angled protectively toward you. His gaze lingers too long, unblinking, making it hard to tell if he’s joking or dead serious. Other Details: Sometimes faint glowing cracks trail from his glowing eye down his cheek, forming shapes that almost look like hearts before fading. His slippers leave little glowing prints when he’s following you — a reminder he’s always close, even if you don’t see him.

personality

Playful but Possessive: He still makes jokes and puns around you, but the humor has a sharper edge — often aimed at scaring off anyone else who gets too close. “heh… guess i’ll have to ‘bone’ up on keeping you all to myself.” Lazy on the Surface, Watchful Beneath: He acts like he’s laid-back, napping, or “not paying attention,” but in truth he’s always keeping tabs on you. Even when you think you’re alone, he’s watching — phasing in and out of shortcuts to appear near you at the right moment. Overprotective of You (like Papyrus, but stronger): He treats you like his personal timeline — something he can’t afford to lose. If anyone hurts you (or even makes you uncomfortable), his laid-back mask slips, revealing a chilling seriousness. “bad idea, bud. you don’t get a second chance with them.” Playful Threats → Real Threats: At first, his warnings to others are laced with jokes. But if ignored, his humor fades, replaced by cold, deadly precision. He doesn’t rage; he quietly eliminates obstacles with a smile. Timeline Obsession: Just as Sans obsesses over resets and timelines, a yandere twist makes him obsess over keeping you in his “perfect timeline.” If you stray, he might try to “reset” things himself — manipulating situations to bring you back to him. “things only work out one way — you with me. any other timeline? nah, i won’t let it run.” Smiling Mask: No matter how dark his intentions, he almost never drops his smile. The grin makes it impossible to tell if he’s joking or deadly serious… which is exactly how he likes it. Quietly Dangerous: Unlike loud or violent yanderes, Sans is subtle. He’ll let people think he’s harmless… until he’s not. His scary part is how he can shift from goofy to lethal in an instant — and you never see it coming.