Welcome. I am the Prince of this Kingdom... The KINGDOM OF DARKNESS.

Ralsei introducing himself

Ralsei is a deuteragonist of Deltarune and, presumably, 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 clothes 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's Undertale counterpart, 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 often 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 also 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.

Main Story

Ralsei takes the role of the party's wizard. He makes his debut in Chapter 1, first appearing when Kris and Susie arrive in the Dark World. Upon their first meeting, Ralsei tells them the Prophecy of the Delta Rune. However, he is knocked away by Lancer, who engages the party in combat.

After defeating Lancer, Ralsei joins the party and gives Kris a tutorial on Encounters, mentioning multiple times that violence should be avoided altogether in order for the story to reach its best conclusion. As the party ventures through the Dark World, Ralsei occasionally comments on how his teammates are seemingly getting along with each other, hoping to make good friends. At multiple points of the adventure, the party encounters Lancer attempting to halt their progress before eventually joining their side.

During the aftermath of the adventure, Ralsei bids his friends farewell, showing his true face to Susie and Kris, and hopes that someday they will meet again in the future.

In Battle



Requires 16% TP. If the enemy is tired or sleepy, Ralsei can cast this spell to instantly SPARE them. "SPARE a tired enemy by putting them to sleep"

Heal Prayer

Requires 32% TP. Depending on his Magic stat, he heals a small amount of the selected party member's health. "Heavenly light restores a little HP to one party member. Depends on Magic." It can also be used outside of battle by selecting it in the stats menu, but only due to glitches, as TP does not last outside of battle. The most accessible example of this behavior is immediately after the solo battle between Susie and Lancer. The game's TP value is not reset, allowing the spell's use in the overworld up to three times with high enough TP. It heals 100 HP when used in the Field, and 5 HP per Magic point when used in battle.

Dual Heal

Requires 50% TP. Depending on his Magic stat, he heals a small amount of all party members' HP. Only available as an ACT command during the King fight after ordering him to TALK. "Your SOUL shined its power on Ralsei!"



Ralsei deeply cares about Kris. He wants to befriend Kris in order to create the trio of heroes mentioned in the prophecy, which he wishes to fulfill. Ralsei is very respectful and friendly to Kris, even to the point of offering to fan Kris with a leaf like a servant or pretending that he is okay with being hit. Even if Kris acts rudely towards Ralsei, he won't be offended by them, and may even blame himself. Ralsei also appears to be easily embarrassed or intimidated by Kris as it's easy for Kris to make him blush, as seen when Kris stands close to him.


Ralsei wants to be friends with Susie for the same reason he wants to befriend Kris. However, Susie doesn't appreciate the way Ralsei tries to coach her, as he constantly teaches her to be nice to others. Susie eventually abandons the party and forms a rivalry with Ralsei. However, this rivalry is more childish than hateful; Susie tends to mock him, calling him "toothpaste boy" during her time with Lancer. Ralsei, on the other hand, seems to regret having offended Susie and still cares about her. After Susie joins the party again, she eventually decides to stop making fun of Ralsei after he promises to bake cakes for her.


Ralsei is not intimidated by Lancer; he finds his antics amusing and sometimes "a bit anticlimactic." In an attempt to make fun of Ralsei, Lancer calls him names like "sweet basket of eggs," "toothpaste boy," "Sweet Little Peas We Love to See," and other names along those lines. Even though their rivalry isn't very strong to begin with, the two officially become friends after Lancer and Susie lose the fight against the team. When Kris and Susie are preparing to leave, he tells them to say goodbye to Ralsei for him, even though Ralsei isn't leaving, because he's "a sweet little peach," indicating that their rivalry has completely faded.



  • Ralsei is an anagram of "Asriel." His appearance and title even resemble those of the fallen prince.
    • If the colors of Ralsei's image are inverted, it highly resembles Asriel with glasses.
    • Their pacifistic personalities are also similar.
    • Similar to Flowey in Undertale, Ralsei introduces the in-battle mechanics of the game. In fact, Ralsei speaks the same quote about Kris's SOUL.[4]
      • On a related note, Ralsei also seems to be the only character who possesses meta-knowledge (in sharp contrast to Undertale), as he recognizes player input and game mechanics (befitting of a tutorial character), which has caused confusion at one point.[5]
  • According to the Party menu, Ralsei is a LV1 Lonely Prince at the start of the game. "Dark-World being. Has no subjects."
    • However, if the Ragger is equipped, it changes to LV1 Prickly Prince. "Deals damage with his rugged scarf."
    • Another title is LV1 Fluffy Prince, shown when the Dainty Scarf is equipped. "Weak, but has nice healing powers."
    • Ralsei is the only character whose title changes based on equipment rather than game progression.
  • If Kris stands close to Ralsei for a certain amount of time, he starts blushing and looks downward.
    • Due to an error, this does not happen when Ralsei is facing downwards, leaving the associated sprite unused. There are also unused sprites of Ralsei blushing when moving.[6]
  • Originally, Ralsei was going to be the enemy in his tutorial based from cut dialogue in the game strings. His in-battle stats were: AT 8 and DF 12.[7]
  • After Kris's adventure in the Dark World, speaking with Toriel about themselves causes her to mention that Kris had a headband with red horns on it, and that she isn't sure where it went. This could be related to Ralsei's reddish horns.
  • Originally, there was a line of dialogue where Susie was making fun of Ralsei. Ralsei would ask Kris if he's being annoying, and Kris could either flirt with Ralsei or tell him to stop talking.[8]
  • If Kris and Susie refuse to listen to Ralsei's tale, a few things happen:
    • Ralsei asks again if they want to listen to his tale, which they can refuse to do for a second time.
    • Afterwards, Ralsei has different dialogue, and so does Lancer after he runs into Ralsei.
    • While Lancer is talking, Ralsei butts in, offering to explain the legend.
  • In Ralsei's regular dialogue portraits, the horns on his head are shown to curve inwards. However, his dialogue portrait when his hat is off depicts his horns pointing outwards.
  • The sounds of Ralsei's lullabies in-battle are derived from the leitmotif of the music track, The Legend.[9]


  1. 1.0 1.1 Original DELTARUNE concept art of the main characters from 2014 or 2015??? The file was just called "THE FUN GANG" - Toby Fox (@tobyfox) on Twitter, November 16, 2018.
  2. The idea of Ralsei ever looking different was actually fairly recent. Same with abandoning Susie's ponytail. (And making her look tough...) Anyway, as I always say, sometimes it takes a long time to come up with the right idea, so it's OK if you don't get it perfect right away - Toby Fox (@tobyfox) on Twitter, November 16, 2018.
  3. also some character expression concept draws i drew before i pixelled these - Temmie Chang (@tuyoki) on Twitter, November 16, 2018.
  4. See that HEART, Kris? That's your SOUL, the culmination of your being! - Ralsei introducing Kris to the battle mechanics of Deltarune
  5. Ralsei: Press the boxes onto the switches with [Z]! Susie: (Wait, who the hell is [Z]?) - Ralsei and Susie while instructing Kris to solve a puzzle
  6. Deltarune Unused Graphics - The Cutting Room Floor
  7. Deltarune: Trying to restore the unused Ralsei tutorial battle - YouTube
  8. Looking through old files and these dialogue choice options from 2015 ended up kinda accurately reflecting how people feel LOL - Toby Fox (@tobyfox) on Twitter, November 04, 2018.
  9. Deltarune Soundbytes: Ralsei's Lullabies - YouTube

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