Aaron is a monster that can be encountered at Firerise. He is swapped with Shyren.



Aaron is a seahorse-like monster has brown skin, and black hair. He has a green fin at the end of his seahorse like body.


He has a personality alot like Shyren. If you hum a song, he will feel better.

In battle

Appears with:

Aaron will attack with music notes from his head. These get faster and more ample every time he is hummed to.


  • To spare Aaron, he must be hummed to at least once.


  • .... .... toot .... [Neutral]
  • Si re, si re si mi si mi [Hum #1]
  • Si Fa Si Fa So Fa So Mi Re Re [Hum #2]
  • Mi So Mi So Mi Si Mi La Si So [Hum #3]
  • (aggressive tooting) [Hum #4]
  • (final toot) [Hum #5]

Flavor Text

  • Tone deaf.He's too ashamed to sing his deadly song. [Check]
  • Aaron hides in the corner but somehow encounters you anyway. [Encounter]
  • A talented singer, with a little help. [Check after humming once]
  • That's Aaron. He's your band-mate. [Check after humming a few times]
  • Smells like music. [Neutral]
  • Aaron thinks about doing karaoke by himself. [Neutral]
  • Aaron hums very faintly. [Neutral]
  • Aaron taps a little beat with his fins. [Neutral]
  • Aaron pretends to be a pop idol. [Neutral]
  • You wave your arms wildly. You are now vulnerable to sweat attacks. [Conduct]
  • You wave your arms wildly. The crowd eats it up. [Conduct after humming a few times.]
  • You smile. You ask to see Aaron´s smile, too. Aaron gets quieter. In the corner, Shyren nods her head approvingly. [Smile without humming / After humming only one time]
  • You keep smiling. But nothing happened. [Smile #2]
  • You give a darling smile and a little wink. The crowd goes wild! [Smile after humming a few times]
  • You hum a funky tune/sad song/jazz ballad. Aaron follows your melody. [Hum #1]
  • Aaron seems much more comfortable singing along. [After humming once]
  • You hum some more. Monsters are drawn to the music. Suddenly, it's a concert... [Hum #2]
  • Papyrus is selling tickets made of toilet paper. [After humming twice]
  • A hooded figure watches the commotion from afar. [After humming twice, if Sans is dead]
  • You hum some more. The seats are sold out. You feel like a rock star. [Hum #3]
  • The crowd tosses clothing. It's a storm of socks. [After humming thrice]
  • You hum some more. But the constant attention... The tours... The groupies... It's all... [Hum #4]
  • Aaron thinks about his future. [After humming four times]
  • You and Aaron have come so far, but it's time. You both have your own journeys to embark on. You hum a farewell song. [Hum #5]
  • Aaron's voice gets raspy. [Low HP]

Main Story

True Pacifist Epilogue

In the Epilogue, Aaron is reunited with his missing friend, In the ending credits sequence, he joins NapstatonHappstablook and Nice Cream guy on tour as Napstaton's back-up singer.


  • Aaron is named after and slightly based on a former roommate of Toby Fox
    • Naming the Fallen Child "Aaron" during the name selection will prompt the response "...?".
  • Aaron is only the big seahorse that has muscles.
  • If Aaron is hummed to 5 times, Madjick can be put to sleep one turn earlier than normal, mentioning that "You sing Aaron's song".
  • Aaron will sometimes utter the phrase "Si-Re Si-Re, Si-Mi Si-Mi" during battle, which may be a reference to "Si-Re Si-Mi" by Franco Godi.
  • Aaron is always encountered, even if the kill counter in the area is depleted.


  • ↑ "You smile. You ask to see Aaron's smile, too. Aaron gets quieter. In the corner, Shyren nods her head approvingly. [Smile without humming / After humming only one time]"- Aaron's Flavor Text

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