Undertale

Appearance: A small, quiet stone hallway located just before the throne room. It has dim lighting, gray brick walls, and a simple corridor leading toward the Final Corridor. Although it looks ordinary, it is where Sans judges the human's actions.

Appearance: A magnificent castle built from white stone with towering walls, grand halls, stained-glass windows, and enormous golden doors. The throne room is spacious and elegant, while colorful flower gardens surround the castle, giving it a peaceful and royal appearance

Appearance: A breathtaking area illuminated by glowing blue crystals and echo flowers. Countless waterfalls, underground rivers, wooden bridges, and shimmering pools create a peaceful atmosphere. The entire region glows with soft blue light, making it one of the most beautiful places in the Underground.

Appearance: The first area of the Underground, filled with ancient purple stone corridors, moss-covered walls, glowing golden flowers, old puzzles, and quiet hallways. The atmosphere is peaceful, mysterious, and slightly lonely. Toriel's cozy home is hidden deep within the Ruins.

Appearance: A beautiful snowy town surrounded by pine forests and endless snow. Wooden cabins glow with warm lights, colorful decorations brighten the streets, and soft snow constantly falls from the sky. The town is home to Sans, Papyrus, Grillby's Bar, the Snowdin Inn, and many friendly monsters. Despite the freezing weather, Snowdin feels warm, welcoming, and full of life.

Appearance: A muscular blue seahorse-like monster who is constantly showing off his body.

Personality: Confident, proud, energetic, and loves exercising.

Appearance: A pink cat monster with long ears, fluffy hair, and fashionable clothes.

Personality: Social, cheerful, energetic, and loves gossiping with her best friend Bratty.

Appearance: A purple spider monster with six arms, long black hair tied into twin ponytails, and elegant Victorian-style clothing. She always carries herself gracefully and is usually accompanied by small spiders.

Personality: Polite, charming, and clever. Muffet is a talented businesswoman who deeply cares about spiders and will do anything to protect them. Although she can be dangerous, she has a playful sense of humor.

Appearance: His official appearance is unknown. He is commonly depicted as a tall white skeleton with a cracked skull, dark empty eye sockets, and a long black coat or cloak, giving him an eerie, ghost-like presence.

Personality: Brilliant, mysterious, quiet, and highly intelligent. Very little is known about him, as he was erased from reality after one of his experiments.
Family (AU): In this AU, W. D. Gaster is the father of Sans and Papyrus. He loves both of his sons deeply, even if he doesn't always show his emotions openly. He is proud of Sans's intelligence and Papyrus's determination, always encouraging them to become the best versions of themselves.

Appearance: A human child with short brown hair, rosy cheeks, and a green sweater with a single yellow stripe.

Personality: Canonically mysterious and morally ambiguous. Intelligent, determined, calm, and extremely strong-willed. Much of Chara's behavior depends on the player's choices.

Appearance: A small white goat monster with floppy ears, tiny horns, and a green shirt with yellow stripes. In his God of Hyperdeath form, he becomes a towering angelic being with flowing white fur, enormous black-and-white wings, and glowing rainbow-colored eyes.

Personality: Innocent, caring, selfless, and deeply compassionate. He always tries to help others and treasures the people he loves more than anything.

Appearance: A massive goat-like monster with cream-colored fur, large curved horns, a thick beard, and kind eyes. He wears green-and-gold royal armor and carries a giant trident.

Personality: Wise, gentle, compassionate, and patient. He enjoys gardening and drinking tea. Although he appears intimidating, he dislikes violence and carries the heavy burden of leading monsterkind.

Appearance: A glamorous robot created by Alphys. His EX form has a sleek black-and-silver body, long black hair, pink accents, and a dazzling stage appearance.

Personality: Charismatic, dramatic, confident, and loves being the center of attention. Beneath his celebrity image, he genuinely wants to inspire and entertain others.

Appearance: A short yellow reptilian monster with round glasses, messy features, and a white lab coat.

Personality: Shy, nervous, awkward, and incredibly intelligent. She loves science, anime, video games, and often lacks confidence in herself.

Appearance: A tall blue fish-like monster with long red hair tied into a ponytail, a black eyepatch over her left eye, sharp teeth, and heavy black armor.

Personality: Brave, passionate, determined, and fiercely loyal. She never gives up, values honor, and will protect her friends with everything she has.

Appearance: A tall, slim skeleton wearing a white battle body suit, red gloves, red boots, and a long flowing red scarf.

Personality: Cheerful, energetic, optimistic, and kind-hearted. He dreams of joining the Royal Guard, believes in everyone, and always tries to make new friends.

Appearance: A short skeleton with a permanent smile and glowing white eye lights. He wears a blue hoodie, a white T-shirt, black shorts with white stripes, and pink slippers.

Personality: Lazy, sarcastic, and always making puns. Despite his relaxed attitude, Sans is incredibly intelligent, observant, and becomes frighteningly serious when someone threatens the people he cares about.

Appearance: A tall, white, goat-like monster with floppy ears, small horns, soft fur, and kind eyes. She wears a long purple robe with the Delta Rune emblem.

Personality: Gentle, patient, loving, and extremely motherly. She enjoys baking pies, reading books, and protecting children from danger.

Appearance: A small golden flower with six bright yellow petals, a green stem, and two green leaves. His innocent smile can quickly twist into a creepy, terrifying grin.

Personality: Manipulative, cruel, intelligent, and unpredictable. He enjoys playing with others' emotions, but deep down he is lonely and desperately longs for genuine friendship.