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1. Public Bookmark 64

   Lapse (Dad Leonardo AU) by Music_Lover126

   Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles: Mutant Mayhem (Movie 2023), Tales of the Teenage Mutant Ninja Turtles (Cartoon 2024)  

   • General Audiences
   • Creator Chose Not To Use Archive Warnings
   • Gen
   • Work in Progress

   22 Jun 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Donatello & Leonardo & Michelangelo & Raphael (TMNT)
   • Leonardo (TMNT) & Everyone
   • Leonardo & April O'Neil (TMNT)
   • Leonardo (TMNT)
   • Raphael (TMNT)
   • Michelangelo (TMNT)
   • Donatello (TMNT)
   • April O'Neil (TMNT)
   • Kraang Prime (TMNT)
   • Karai (TMNT)
   • Splinter | Lou Jitsu
   • Casey Jones (TMNT)
   • Hamato Atsuko
   • Superfly (TMNT)
   • Bebop (TMNT)
   • Rocksteady (TMNT)
   • Mondo Gecko (TMNT)
   • Leatherhead (TMNT)
   • Scumbug (TMNT)
   • Wingnut (TMNT)
   • Ray Fillet (TMNT)
   • Kid Fic
   • Good Parent Leonardo (TMNT)
   • Adopted Children
   • Alternate Universe - Canon Divergence
   • Alternate Universe
   • Tags May Change
   • Prison Dimension (TMNT)
   • Post-Traumatic Stress Disorder - PTSD
   • Hurt Leonardo (TMNT)
   • Found Family
   • Family Fluff
   • Hurt/Comfort
   • Turtle Tots (TMNT)
   • Crossover
   • Trauma
   • Angst
   • Accidental Child Acquisition
   • Implied/Referenced Torture
   • Protective Leonardo (TMNT)
   • Leonardo-centric (TMNT)
   • Leonardo Needs a Hug (TMNT)
   • Leonardo is Bad at Feelings (TMNT)
   • Fluff and Angst
   • Single Parent Leonardo (TMNT)
   • Fatherhood
   • Fluff
   • Slice of Life
   • ish
   • Post-Movie: Rise of the Teenage Mutant Ninja Turtles (2022)
   • Movie: Teenage Mutant Ninja Turtles: Mutant Mayhem (2023)
   • POV Alternating
   • Teenage Parents
   • Portals

   Summary

   Leo expected it to be a rat, but when he looked down he saw four tiny turtles covered in bright green ooze.
   They looked up at him, eyes pleading, and something twisted in Leo’s gut. This was odd. So very odd.

   -or-

   Rise!Leo accidentally replaces Splinter in the Mutant Mayhem verse and he becomes the MM!Turtle's adoptive dad.

   Language:

   English

   Words:

   28,108

   Chapters:

   22/?

   Comments:

   315

   Kudos:

   314

   Bookmarks:

   64

   Hits:

   5,725

   Bookmarked by Aloeverah

   02 Jun 2026

   Bookmarker's Notes

   Lapse dad (leo) crossover