About Undertale Characters
Welcome to the comprehensive Undertale characters list and database. Here you’ll find detailed profiles of all major and supporting characters in the Undertale series. Each profile covers abilities, personality traits, backstories, and relationships.
What You'll Discover
- Complete character bios and personality types
- Unique abilities, roles, and gameplay traits
- Lore connections, occupations, and recurring appearances
Character Roles in Undertale
Undertale features a wide variety of characters with distinct roles and responsibilities:
- Royal Scientist characters
- King of Monsters characters
- Prince of Monsters (True Pacifist Final Boss) characters
- First Fallen Human characters
- Main Antagonist characters
- Fallen Human (Player Character) characters
Below you’ll find the complete list of Undertale characters, organized for easy browsing and discovery.

Alphys
The Underground’s Royal Scientist. Alphys is brilliant but anxious, obsessed with anime and human culture, and burdened by the consequences of her Determition experiments.
Personality
Abilities

Asgore
The kind but tragic king of the Underground. Asgore seeks to break the barrier trapping monsters by collecting human SOULs, but he deeply regrets the path that led to war.
Personality
Abilities

Asriel Dreemurr
The prince of monsters and son of Asgore and Toriel. Asriel’s story is tied to the first fallen human and to Flowey; in the True Pacifist route, he becomes the fil boss with overwhelming power.
Personality
Abilities
Chara
The first human to fall into the Underground. Chara was adopted by the Dreemurrs, and their legacy is closely tied to the game’s darkest route and rrator-like presence.
Personality
Abilities

Flowey
A sentient flower with no soul who manipulates events from the shadows
Personality
Abilities

Frisk
A human child who falls into the Underground. Frisk’s actions—mercy, violence, and everything between—shape how monsters respond and which ending the world reaches.
Personality
Abilities
Notable Items
* (You're filled with determition.)

Mettaton
A ghost who inhabits a robot body built by Alphys. Mettaton is a glamorous star in Hotland, hosting shows and chasing fame—with multiple combat-capable forms.
Personality
Abilities
OH YES!

Monster Kid
An enthusiastic young monster from Waterfall who idolizes Undyne. Monster Kid is brave in spirit, often trying to do the right thing despite being outmatched.
Personality
Abilities
Napstablook
A shy ghost found in the Ruins. pstablook prefers quiet hobbies like listening to music and making lo-fi tracks, and can become a gentle encounter depending on your choices.
Personality
Abilities

Papyrus
Sans’s enthusiastic younger brother. Papyrus is earnest, dramatic, and determined to join the Royal Guard by capturing a human—yet he’s also genuinely kind.
Personality
Abilities

Sans
A laid-back skeleton known for bad jokes and sharp observations. Sans acts as a moral judge of the player’s actions—and becomes a deadly opponent on the Genocide route.
Personality
Abilities
Temmie
A quirky Temmie from Temmie Village in Waterfall. Temmies are known for their odd speech patterns, humor, and the Tem Shop.
Personality
Abilities
Notable Items

Toriel
The former queen of the Underground who lives in the Ruins, protecting any fallen humans. Toriel is gentle but firm, and she refuses to accept more children dying for the barrier.
Personality
Abilities

Undyne
The fierce captain of the Royal Guard. Undyne is bold and heroic, initially hunting the human for Asgore’s cause—yet she can become one of Frisk’s strongest allies.
Personality
Abilities

W.D. Gaster
A hidden figure associated with rare events and corrupted text. The game implies a connection to a former Royal Scientist, but most details about W.D. Gaster are intentiolly unclear.