Undertale and Deltarune are fantasy role-playing video games developed by Toby Fox. They take place in different fictional universes, but feature many of the same characters. Undertale is set in a world where monsters once coexisted with humans on the planet's surface, but, after an ancient war, were trapped in the Underground and forgotten. The game follows Frisk, a human child who falls into the Underground via an opening adjacent to Mount Ebott, and seeks to escape. In Deltarune, considered a spiritual successor to Undertale, humans and monsters still coexist. Set in Hometown, the game follows Kris, who discovers a Dark World, an alternate view of reality inhabited by Darkners, living representations of real-world objects. They embark on a quest to close the Dark Fountains giving these Worlds form before darkness overtakes the real world. The following is a list of major characters who appear in one or both games in the series. The characters have been praised by critics and fans for their humor and in-depth characterization shown through different moral choices. Some characters gained notoriety for their ability to break the fourth wall, manipulating gameplay elements normally only accessible to the player, such as saving.
Creation and conception
Toby Fox is the lead designer, writer, and primary composer for Undertale and Deltarune, while Temmie Chang and other guest designers design the characters. For Undertale, Fox felt it was important to make each of the game's monsters "feel like an individual". He cited the Final Fantasy series as the opposite; "all monsters in RPGs like Final Fantasy are the same ... there's no meaning to that".
Undertale and Deltarune
Toriel and Asgore Dreemurr
Toriel, a powerful goat-like woman (belonging to a race known as the "Boss Monsters") living in the Ruins, is among the first characters met by the protagonist. She is the former queen of the Underground, where monsters live. Her ex-husband is its king, Asgore, with whom she had a child, Asriel, and adoptively raised a human child, Chara. After Chara's untimely death, Asriel wielded their soul to cross the barrier and return their body to the surface, but was killed by humans in the process. Enraged, Asgore determined to collect human souls over time from those entering the Underground, until he would have enough to free monsterkind and take revenge on humanity. Toriel, sickened by her husband's obsession and cowardice, departed to live in seclusion among the Ruins below Mount Ebott. She takes the protagonist in after they fall into the Underground, and she attempts to keep them from leaving due to the worry that her ex-husband would hurt them; she is either killed or persuaded to let the protagonist leave. Asgore awaits the protagonist at the end of their journey, where they are forced to battle. Asgore only survives in the game's "True Pacifist" route; otherwise, he is killed by either the protagonist or Flowey. As Boss Monsters, once Toriel and Asgore have children, they only grow alongside their children, and cease to grow if their progeny disappears or dies. In Deltarune, Toriel and Asgore are also separated. They are the parents of Asriel and the adoptive parents of the main protagonist, Kris. Kris lives with Toriel, a teacher, while Asgore, formerly Hometown's chief of police, lives apart from them at his "Flower King" flower shop. After an as-yet unspecified incident involving a Dark World, Asgore was fired from the police and became obsessed with collecting evidence to clear his name, straining his relationships. Mysteriously, the Knight attempts to kidnap Toriel and Asgore, failing to take the former in her sleep in Chapter 3, but succeeding with the latter in Chapter 5.
Asriel Dreemurr
In Undertale, Asriel is the deceased son of Toriel and Asgore, and the former prince of the Underground. Chara, his adoptive human sibling, convinced him to participate in a plot to collect six human souls from the surface, starting by them killing themself. After absorbing Chara's soul and leaving the Underground, Asriel refused to fight back against the humans who mistook him for Chara's murderer and was killed by them. Asriel was later reincarnated as Flowey by Alphys, but without a soul, he lacks empathy and compassion in this form. In the game's "True Pacifist" route, Flowey transforms into an adult representation of Asriel, known as the "God of Hyperdeath," serving as the final boss of the route. After being defeated, Flowey temporarily reverts to the child form of Asriel and regains his empathy, long enough to share a tender moment with the protagonist and break the Underground's barrier. Jason Schreier of Kotaku called Asriel's final boss fight one of the greatest in video game history, citing its climactic music and the necessity to save your friends from him. Describing the sequence as "spectacular", he stated that, "if you're not already bawling as you mash the SAVE button over and over again during the final part of this fight, well... you will". In Deltarune, Asriel is Kris's adoptive older brother who has left for college. He has not yet made a physical appearance in the game, but has been referenced numerous times with characters anticipating his return to Hometown.
Sans and Papyrus
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