Frisk and Chara, Undertale characters, side by side, friendly pose, smiling, short brown hair, striped shirts, knee-length pants, sneakers, heart locket, knife, pixel art style, underground setting, glowing flowers, determination, SAVE point, soft lighting, digital painting, vibrant colors, dynamic duo, action stance, 3/4 view, detailed expressions, companionship theme, ambient magical atmosphere, cave-like textures, stone and moss, warm and cool contrast, medium shot.