Frisk, Undertale, child, ambiguous age, short brown hair, blue and purple striped shirt, blue pants, walking, neutral expression, determination, pixel art style, underground setting, Ruins background, Toriel's house visible, soft lighting, side view, 3/4 perspective, adventure, RPG elements, heart locket, stick as weapon, friendly monsters, pacifist route, exploration, puzzle-solving, interactive environment, ambient magical glow, indie game aesthetic.