Who Is King Multiverse Sans In Undertale?

My boyfriend stole my last food and fuel, abandoned me to a zombie horde, and ran off with his mistress. Then I woke up three months before the apocalypse. This time, I’m taking everything for myself. Armed with memories of the future and a mysterious Level-Up System, I escape to the mountains, build a fortress, recruit dangerous allies, and carve out a kingdom in the ruins of the world. Now the man who betrayed me wants forgiveness. Unfortunately for him, I’ve become far more dangerous than the undead.

He was once a simple boy, drifting aimlessly along with the flow of the world. But one day, he awakened to find himself being different from his usual self, finding himself now hosting the body of a newborn. He had been reincarnated, that too as the sole prince and heir of the human empire. Now living in a world of sword and magic, filled with fantastical beasts, demi-humans, divine beasts, Goddesses and so much more. Life finally seemed to take a turn for the better for the reincarnated boy. However, as always, reality had its cruel ways of disappointing him. His parents died shortly after his birth in a war to save humanity, subjecting him to the life of an orphan. All the people vying for the throne turned against him, looking for any and all opportunities to kill him, the last living heir to the throne. Fortunately, he had his aunt, his last living family, who helped protect him by becoming the acting queen but this came with the price of being holed up in his palace till his ‘awakening’ which would enable him to defend himself and survive in this cruel world…

Alaric Thorn was just a blacksmith in the 12th century—a husband, a father, a simple man. Until the day everything was taken from him. His wife murdered. His daughters stolen. And he himself slaughtered, powerless to protect the people he loved. But death did not end his story. Dragged into a supernatural realm after dying, Alaric made a desperate bargain: power in exchange for completing a mission in the future. A mission he did not understand. He returned to Earth centuries later—only to realize his revenge no longer existed. Four hundred years had passed. His family long gone. Their killer long dead. And Alaric… could no longer die. Cursed with immortality, he wandered through ages and empires, trying every possible way to end his life—failing each time. All he wanted was to go back in time and fix what he had lost. But when he finally stepped into a time machine, fate betrayed him again. Instead of the past… Alaric was thrown into another realm entirely—a brutal world crawling with monsters, ancient races, and system-like powers. Here, strength must be earned through blood, each battle pushing him closer to awakening his true potential. In this realm, he is no longer just a wanderer. He is a rising lord. A conqueror. A man destined to build an empire strong enough to challenge a king— a king who bears the same name as the monster who destroyed his life on Earth. As Alaric fights beasts, defeats tyrants, and gathers allies and armies, he discovers the truth behind the mission he accepted centuries ago: To reclaim his fate… To break his immortal curse… To rewrite the destiny stolen from him… He must rise as the Immortal King. The true master of the Dark Realm he was fated to rule.

A 25 years old boy named John is suddenly shot by his friend, which results in his death, but is reincarnated again as the new Demon King. Unfortunately, he agains dies in a battle. This time also he is reincarnated but as a human. Follow Vis' adventure as he gets revenge, becomes a demon and makes his own harem.

Tasoshi Saya, the Supreme God of Zeronity. He was the strongest god to ever live. A mountain of strength that could never be crossed. On the day of his match against his opponent, the Breakers—he was suddenly transported into another world. A world filled with swords and magic. Power? Glory? All that was lost as he entered into the new world. Yet, despite his helplessness, the 'Supreme' God of Zeronity was excited. Challenges that will arise from the weak, opponents whom would stand against him toe to toe—the journey begins.

She has fallen in love with a character from a book she has read a thousand times and after an incident, has awakened in her arms, but who knew that one's opinion could change so much upon seeing the actions of such a being up close. Even though she no longer sees him romantically, she wants to save him and his little son, she wants to give everyone a happy ending, but... what if they are right in the middle of THEIR happy ending? It should be okay, right? After all... This was never a story about King Callisto.