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1. Public Bookmark 12

   UDY on the Surface by CommanderBullet

   Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)  

   • Teen And Up Audiences
   • No Archive Warnings Apply
   • Multi
   • Work in Progress

   15 Feb 2026

   Tags

   • No Archive Warnings Apply
   • Noelle Holiday/Susie
   • Alphys/Undyne (Undertale)
   • Ceroba Ketsukane/Starlo (Undertale Yellow - Master Sword)
   • Kris/Ralsei (Deltarune)
   • Flowey & Napstablook (Undertale)
   • Asgore Dreemurr/Toriel
   • Papyrus & Sans (Undertale)
   • Sans & Toriel (Undertale)
   • Martlet/Moray (Undertale Yellow - Master Sword)
   • Burgerpants | Pizzapants/Nice Cream Vendor (Undertale)
   • Spamton G. Spamton/Tenna
   • Chara (Undertale) & Clover (Undertale Yellow - Master Sword)
   • Kris & Ralsei & Susie (Deltarune)
   • Frisk (Undertale)
   • Toriel (Undertale)
   • Asriel Dreemurr
   • Asgore Dreemurr
   • Chara (Undertale)
   • Kris (Deltarune)
   • Flowey (Undertale)
   • Undyne (Undertale)
   • Alphys (Undertale)
   • Mettaton (Undertale)
   • Napstablook (Undertale)
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Mad Mew Mew (Undertale)
   • Susie (Deltarune)
   • Ralsei (Deltarune)
   • Noelle Holiday
   • Berdly (Deltarune)
   • Burgerpants | Pizzapants (Undertale)
   • Muffet (Undertale)
   • Spamton G. Spamton
   • Rudy Holiday
   • Carol Holiday
   • Monster Kid (Undertale)
   • Lancer (Deltarune)
   • Jevil (Deltarune)
   • W. D. Gaster
   • Rouxls Kaard
   • King of Spades (Deltarune)
   • Tasque Manager
   • Queen (Deltarune)
   • Clover (Undertale Yellow - Master Sword)
   • Ceroba Ketsukane (Undertale Yellow - Master Sword)
   • Starlo (Undertale Yellow - Master Sword)
   • Martlet (Undertale Yellow - Master Sword)
   • Moray (Undertale Yellow - Master Sword)
   • Ed (Undertale Yellow - Master Sword)
   • Ace (Undertale Yellow - Master Sword)
   • Mooch (Undertale Yellow - Master Sword)
   • Dalv (Undertale Yellow - Master Sword)
   • Axis (Undertale Yellow - Master Sword)
   • Tenna (Deltarune)
   • Gerson Boom
   • Various Background OCs
   • Fluff and Humor
   • Fluff and Angst
   • Slice of Life
   • Alternate Universe - No Dark Worlds (Deltarune)
   • Crossover
   • LGBTQ Themes
   • Background Relationships
   • Ensemble Cast
   • Alternate Universe
   • My First Fanfic

   Summary

   It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.

   Language:

   English

   Words:

   109,804

   Chapters:

   29/?

   Comments:

   54

   Kudos:

   95

   Bookmarks:

   12

   Hits:

   3,702

   Bookmarked by Shmancy_guy

   01 Nov 2025