Undertale comic book, Papyrus, Sans, Toriel, Asgore, underground city, colorful buildings, bright lights, bustling streets, fantasy creatures, anthropomorphic animals, monsters, skeletons, ghosts, flowers, vines, trees, rocks, earthy tones, whimsical atmosphere, vibrant colors, dynamic composition, action scenes, dialogue bubbles, expressive facial expressions, dramatic lighting, cinematic shading, detailed textures.