Altertale is an Undertale AU created by friisans where six characters have changed their roles with others. Sans has swapped with Toriel, Papyrus with Asgore, and Gaster with Asriel. There are no other swapped characters whatsoever. According to the creator, the characters take 80% 0f the personality of the character they take the role of, and retain 20% of their own.
Undertale is a 2015 2D role-playing video game created by American indie developer Toby Fox. The player controls a child who has fallen into the Underground: a large, secluded region under the surface of the Earth, separated by a magical barrier. The player meets various monsters during the journey back to the surface, although some monsters might engage the player in a fight. The combat system involves the player navigating through mini-bullet hell attacks by the opponent. They can opt to pacify or subdue monsters in order to spare them instead of killing them. These choices affect the game, with the dialogue, characters, and story changing based on outcomes.Papyrus (/pəˈpaɪrəs/ pə-PY-rəs) is the brother of Sans and a major character in Undertale. His main motive is to capture a human so he can become a member of the Royal Guard, and finally have friends and popularity.
Sans (/sænz/) is the brother of Papyrus and a major character in Undertale. He first appears in Snowdin Forest after the protagonist exits the Ruins. He serves as a supporting character in the Neutral and True Pacifist routes, and as the final boss and heroic antagonist in the Genocide Route.
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Underfell
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Underswap
Underswap animation
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Edgy Sans