A UTAU i made up a while after seeing Endgame. Sans is essentially Thor, and Papyrus is essentially Loki. As per the MCU, Papyrus is dead, and Sans blames himself for his death. Despite all that, Mjolnir still deems Sans worthy. So when a human falls to the underground and begins a genocide run, Mjolnir calls Sans to action. However, still depressed over his brother's death still, he doesn't do anything until he hears news of what the human has done. After he realizes what the human has done, he gains Stormbreaker, and with the combined power of Mjolnir and Stormbreaker, he stands in their way in the Judgement Hall.
I own the character. I do not own Sans, Thor, Mjolnir or Stormbreaker.
