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"Welcome. I am the Prince of this Kingdom... The KINGDOM OF DARKNESS."
– Ralsei introducing himself

Ralsei is a deuteragonist of Deltarune as the "Prince from the Dark" Hero of Light, as foretold in the Prophecy.



Ralsei appears as a short Darkner resembling a boss monster. He wears a wizard's outfit, complete with pastel-green tints on his cape and hat. He also has a long magenta scarf wrapped around his neck and dons a pair of green colored glasses. When taking off his hat, it is revealed his face is quite similar to that of Asriel, with the exception of glasses, pink shaded horns, and pink fur accents.


Ralsei is a kind-hearted Darkner who appears amiable and optimistic towards his teammates. Ralsei also displays signs of affection towards Kris and Susie, due to their willingness to help him fulfill the Prophecy. Unlike Susie, it appears that he dearly hates violence and prefers to solve most conflicts with pacifism. Ralsei is too trusting of others, an example of which can be found in the fight with King. After King is defeated, he feigns surrender to the party. Ralsei trusts him and heals him, after which King immediately betrays and attacks the party.

Ralsei enjoys baking cakes for his friends and seems quite flustered when revealing his actual face in front of his allies.

AUs containing Ralsei

Note that Deltarune was not fully released yet. So, new chapter may coming soon...
  • Ralsei With A Gun
  • Deltafell
  • Deltaswap
  • Outerrune
  • Errorrune
  • Deltafresh
  • Inkrune
  • Reaperrune
  • Deltamafia
  • Littlerune
  • Horrorrune
  • HELP_rune
  • Dancerune
  • Deltalust
  • Deltakeep
  • Deltapants
  • Ralsei from Another Universe



  • Ralsei is an anagram of "Asriel." His appearance and title even resembles that of the fallen prince.