Players searching for all characters in Undertale are usually looking for a complete, spoiler-aware guide to the cast of one of the most beloved indie role-playing games ever made. Undertale, created by Toby Fox and first released in 2015, is famous for a world in which every monster you meet can be befriended, fought, or fled from, and where your choices genuinely change the story. That design means the cast is unusually large and memorable: shopkeepers, scientists, comedians, royalty, and a skeleton or two all share a single underground world, and many of them remember what you did long after you did it. This guide lists all characters in Undertale by region and role, explains who matters most, and helps new players keep track of a wonderfully strange ensemble.
A note on spoilers is essential before the list begins. Undertale is a game best experienced with fresh eyes, and some character details below reveal story developments, including hidden bosses and late-game revelations. If you have not finished the game and want to avoid major surprises, read the early sections for the main cast and save the later sections for after your first playthrough. If you have already finished, or you are returning for another route, the full list will help you place every face you meet, from the Ruins to the final corridor.
All Characters in Undertale: The Main Cast
The heart of all characters in Undertale is a small group whose fates drive the story. Frisk is the human child you control, a silent protagonist who falls into the Underground and whose choices shape every ending. Flowey, a talking golden flower, is your first guide and one of the game’s most unsettling presences, cheerful on the surface and hiding a long, strange history. Toriel, the goat-like caretaker of the Ruins, rescues Frisk and offers a home, embodying the game’s central question: will you stay, or will you push onwards? Her kindness sets the tone for everything that follows.
Beyond the Ruins, the main cast widens quickly. Sans and Papyrus, a pair of skeleton brothers, are the game’s most iconic characters: Papyrus, earnest and loud, dreams of joining the Royal Guard, while Sans, laid-back and fond of jokes, watches over events with far more understanding than he lets on. Undyne, the heroic captain of the Royal Guard, pursues Frisk with fierce determination and becomes one of the game’s most respected characters. Alphys, the Royal Scientist, is anxious, brilliant, and deeply involved in the Underground’s hidden history. Asgore, the king of the Underground, and Toriel, his former queen, carry the tragedy at the story’s centre. Together, these characters form the spine of the game, and every route through Undertale is defined by how you treat them.
Frisk and the Fallen Humans
Frisk is the eighth human to fall into the Underground, following earlier children whose fates are part of the world’s backstory, plus one more whose story is revealed late in the game. The fallen children are rarely seen directly, but their presence hangs over the plot: their souls powered the barrier, and their stories explain why the Underground’s monsters fear and hope for humanity in equal measure. Chara, the first fallen child, is the most significant of these figures, and their relationship with Asriel, the king’s son, is the emotional core of the game’s deepest lore. Understanding Frisk’s place in this sequence helps explain why the monsters react to a human child with such a mixture of fear, hope, and grief.
The Dreemurr Family
The Dreemurr family ties the story together. Asgore and Toriel were once king and queen, and their son Asriel was the prince of the Underground before tragedy split the family apart. Asriel’s story, told in fragments across the game, is one of the most moving in the medium, and it reaches its fullest expression in the game’s true pacifist ending. Toriel’s decision to leave the capital and care for fallen humans in the Ruins, and Asgore’s lonely rule from the throne room, are two sides of the same grief. When players finally understand this family, the whole game clicks into place.
All Characters in Undertale by Region
The Underground is divided into regions, and each has its own residents. The Ruins introduce Toriel, Flowey, and the whimsical Froggit, Whimsun, Moldsmal, and Migosp monsters, plus Napstablook, a shy ghost who later pursues music. Snowdin brings Sans and Papyrus, the shopkeeper, the innkeeper, and a host of cheerful townsfolk, along with the dog guards Doggo, Dogamy, and Dogaressa, the Greater Dog, and the eccentric Lesser Dog. Waterfall adds Undyne’s domain, the monster kid, the echo flower caverns, and the hidden True Lab beneath Alphys’s laboratory, where the story’s darker experiments come to light.
Hotland and the CORE introduce Alphys’s world more fully, along with Mettaton, the robot television star who stages elaborate shows and boss encounters, plus the royal guardsmen and resort staff of the MTT Resort. New Home and the capital bring the story to its climax, with Asgore, the final corridor, and the judgement that awaits depending on your actions. Each region also hides optional characters: the mysterious followers of the vanished scientist W. D. Gaster, the clam girl who hints at neighbouring worlds, and the Annoying Dog, a small white dog who steals artefacts and appears in the most unexpected places. Exploring thoroughly is rewarded with encounters that many players miss on a first run.
Snowdin Townsfolk and Friends
Snowdin’s residents deserve a special mention because they show Undertale’s warmth at its best. The town is full of monsters who invite Frisk to stay, share jokes, and offer small kindnesses, from the innkeeper who restores health to the shopkeeper who stocks useful items. Grillby, the fire-elemental bartender, runs a quiet bar where Sans often sits, and his wordless presence has made him a fan favourite. Monster Kid, who follows Frisk through Waterfall with boundless admiration for Undyne, represents the younger generation of the Underground and gives the story some of its most touching moments. These smaller characters prove that Undertale’s world is not only about bosses and battles; it is about a community.
Waterfall, Hotland, and the CORE
Waterfall is home to Undyne’s house, the quiet river, and the haunting statue of a dreaming figure, as well as the Temmie village, where the cat-like Temmies speak in broken, cheerful phrases and run a shop with famously odd pricing. Hotland introduces the laboratory, the CORE’s puzzles, and Mettaton’s rise to stardom, with his cousin Napstablook’s musical ambitions providing a gentle counterpoint to the spectacle. The MTT Resort staff, including the burger-selling employee and the guards who patrol the area, add everyday texture to the game’s most artificial region. Even the river person, a hooded ferryman who speaks in riddles, adds to the sense that every corner of the Underground holds someone worth meeting.
All Characters in Undertale: Supporting and Secret
Beyond the main cast, all characters in Undertale include a long tail of supporting and secret figures. Muffet, the spider baker of Hotland, runs a bake sale with a grudge, and her battle is one of the game’s most stylish encounters. The Mad Dummy and later Mad Mew Mew add comic menace, while the amalgamates of the True Lab, including Memoryheads, Reaper Bird, and Lemon Bread, represent the game’s most disturbing lore, the results of Alphys’s experiments with determination. So Sorry, a hidden character found through a secret door, is a small, apologetic artist whose entire appearance is a joke about hidden content. The Gaster followers, three grey figures in different locations, speak cryptically about a scientist who vanished from history, and they remain one of the fandom’s favourite mysteries.
Other memorable figures include Burgerpants, the exhausted fast-food worker; the Nice Cream Guy, who sells frozen treats with relentless optimism; Bratty and Catty, a pair of gossiping shopkeepers; and the many shopkeepers and innkeepers who keep the Underground running. Each of these characters has a distinct voice, and many of them change their dialogue based on your route, rewarding players who talk to everyone. This is why guides to all characters in Undertale run so long: the game treats even a single-scene shopkeeper as a person with opinions, worries, and a life beyond your visit.
| Character | Region | Role |
|---|---|---|
| Toriel | Ruins | Caretaker and former queen |
| Sans and Papyrus | Snowdin | Skeleton brothers, comic heart of the game |
| Undyne | Waterfall | Captain of the Royal Guard |
| Alphys | Hotland | Royal Scientist |
| Mettaton | Hotland and CORE | Robot television star |
| Asgore | New Home | King of the Underground |
| Flowey and Asriel | Throughout | Guide, antagonist, and lost prince |
| Muffet | Hotland | Spider baker and optional boss |
All Characters in Undertale: Frequently Asked Questions
How Many Characters Are in Undertale?
There is no single official count, because the game includes dozens of named characters plus many generic monsters that appear in random encounters. A reasonable answer is that the main story involves around a dozen central figures, the towns and regions add several dozen named residents, and the full cast including minor monsters, shopkeepers, and secret characters runs well past one hundred. The exact number depends on whether you count generic encounter monsters as characters, which is why different guides give different totals.
Who Is the Most Important Character?
That depends on the route you play. In a pacifist run, Asriel and the Dreemurr family carry the emotional climax, while in other routes Flowey and Sans take centre stage. Frisk is always the protagonist, but the game’s genius is that importance shifts with your choices. No single character owns the story; the story belongs to the whole Underground, which is why players argue so passionately about their favourites.
Are There Characters Only in Certain Routes?
Yes. Some encounters, bosses, and dialogue scenes appear only on specific routes, and a few characters are easy to miss entirely without exploring optional areas. The True Lab characters, the secret bosses, and the hidden followers all reward thorough exploration. This route-dependence is also why replaying the game feels fresh: a second run can introduce characters you never met the first time.
Where Can I Learn More About Game Characters?
Community wikis and official art books offer deep dives into each character’s backstory, dialogue, and design. For other character guides on this site, see our guide to famous character names and a round-up of animated character names. As always, the game itself remains the best source: talk to everyone, check every room, and spare generously.
Why the Full Cast Matters
One reason guides to all characters in Undertale stay popular years after release is that the game’s cast rewards attention. Knowing all characters in Undertale helps you catch jokes, foreshadowing, and callbacks that a quick playthrough misses, and all characters in Undertale change their dialogue based on your choices, so a list of all characters in Undertale is really a map of possible stories. Whether you are meeting all characters in Undertale for the first time or revisiting old favourites, the full roster shows how much care went into a world where even a shopkeeper has a personality. Exploring every region, talking to everyone, and learning all characters in Undertale by name turns a good playthrough into a great one, and it explains why fans still discuss all characters in Undertale with such affection today.
Conclusion
From Toriel’s quiet kindness in the Ruins to Sans’s judgement in the final corridor, all characters in Undertale combine into one of gaming’s richest ensembles. The main cast drives an unforgettable story, the regional townsfolk give the Underground its warmth, and the secret characters reward curiosity with mystery. Whether you are planning a first playthrough or returning for another route, knowing the cast helps you appreciate how every encounter, however small, contributes to the whole. Take your time, talk to everyone, and enjoy meeting them all.
