18 Works in Age Regression Little Leonardo (TMNT)
Listing Works
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Two Years, Two Keys by Purpleandbluelove24
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types
10 Oct 2025
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Summary
Two years after the near Krang invasion and the eve of their 19th birthday, Donnie notices that Leo is not himself, becoming quieter and more distant. With some gentle coaxing, Leo finally breaks down, confessing that he has felt trapped and tired, the trauma from his near-sacrifice and the invasion not leaving him even after two years. Donnie decides to do something about and surprises Leo with an apartment that the two of them can share together
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A series of stories of Leo and Donnie sharing an apartment in the Hidden City together, full of laughs, tears, and healing that can only be shared between two twins
Series
- Part 31 of I love the disaster twins
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In the Footsteps of a Child by FadedLilly06
Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)
06 Oct 2025
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Summary
Leo isn’t one to be vulnerable, instead, she buries her problems in hopes they’ll disappear. But sometimes she doesn’t have a choice.
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Leo is sometimes little and her family convinces her that it's okay. (Little Leo oneshots)
Series
- Part 2 of Tmnt Oneshots (rottmnt/2012)
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The moods surrounding blue by Averie_sol
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
02 Jun 2025
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Summary
leo has these... mood swings? is that what you'd call it? coping mechanisms dont work, he lashes out. He manipulates to get what he wants he needs- no craves control. He loves his brothers with everything in him but theres so much comfort in feeling out of your mind.
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OR leo thinks hes some horrible manipulative fuck up in this fan fic of i take some of my personal experiences, wildly let it take a turn, spin it so leo mayhaps has BPD, totally has PTSD, depression anxiety, etcetera etcetera (because theres totally a universe where hes borderline) and let the angst begin because he has seventy thousand different mental issues ;)
THERE IS TRIGGERING CONTENT. PLEASE READ AT YOUR OWN RISK <3
Series
- Part 1 of Rise Leonardo-centric
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i need someone to take, a little of the weight by olivr_the_gr8
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
03 May 2025
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Summary
The city survived the invasion and Leo’s trying to keep up. His brothers are getting better, and he feels like he's struggling to catch up. Some nights, soft pajamas and a soft blanket are the only things keeping him grounded as he holds onto quiet comforts he’s not ready to share.
OR, Leo regresses after a perfectly normal, regularly scheduled day on the surface. Donnie finds him. They both find each other hiding similar secrets and bond in silence.
Series
- Part 5 of agere !!
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My Body is made of Crushed Little Stars by Averie_sol
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
02 Nov 2024
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Summary
Leo wasn't one to ask for help for anything ever, but when he was regressed he had no choice.
Of course he needed help sometimes.
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or, our favourite blue turtle isnt having an amazing day filled with comfortable sensory stimulation levels, and the only thing that could make it worse is his brothers mild irritation at his existence.
Mikey to the rescue!
Series
- Part 17 of 2012 leonardo-centric
- Part 9 of CASEYNARDO
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skating antics and slippery socks by qi_agere_fluff
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
03 Oct 2024
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Summary
Nellie and Kiki regress at the same time, a rare but always enjoyable occurrence. Today the energetic little ones have found some fuzzy socks and are pretending to ice-skate!
Series
- Part 9 of ✨ ooey-gooey agere snapshots ✨
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Smaller Melodies by Beaniesintheclouds, starlitbluehues
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types
01 Aug 2024
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Summary
Leo awakens from a nightmare, the faded memories of terror causing him to regress. Mikey finds him, and he navigates the new mantle of being a big brother; one he takes very seriously as he gets the little to smile!
Series
- Part 2 of ✩ Little Melodies ✩
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Even a princess deserves a break by Werewolf_Origins
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
07 Mar 2024
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Summary
Shortly after the second Kraang invasion, the gang are all back to regularly functioning in New York. On a surface level at least. Tensions are still high, feelings unexpressed, and something is bound to snap eventually.
Or: Leo has a breakdown, but gets oh so very much comfort later :D
Series
- Part 5 of Leo-centric TMNT 2012
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late wake-ups and sick tummies by qi_agere_fluff
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
28 Jan 2024
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Summary
Leonela catches the stomach bug Raph had and regresses, and a sick little Nellie is an anxious and insecure little Nellie. Luckily, her brothers are there to help her feel better, just like always.
Series
- Part 5 of ✨ ooey-gooey agere snapshots ✨
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Little Melodies by Beaniesintheclouds, starlitbluehues
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types
23 Jan 2024
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Summary
Leo has a panic attack after a nightmare and ends up accidentally regressing for the first time. Thankfully for him, his beloved twin is there to help pick up the pieces and figure things out.
Series
- Part 1 of ✩ Little Melodies ✩
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Summary
this is one of the first pieces of work on this account, meaning its old. the first few chapters may be awfully written and ive not gone back through an edited anything. however, give it a chance! despite the bad writing i assure you its worth the read.
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Today was a bad day for leonardo. Hes had bad days before and always hides them. He doesnt understand why hes so stressed out, why he cant speak, why everything is just too loud and bright and disgusting horrible textures oh my god- its fine he can hide it. Its just weaknesses!
Until he cant hide and his family finds out. His brothers find out theres something wrong with him. Donnie comes to a conclusion, and explains to him that there isnt anything wrong with him,Hes just autistic, and thats okay.
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OR how leo got a very late autism diagnosis after a meltdown, and then learns to be more open about his sometimes very concerning mental health.
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rarely ever hurt/no comfort, and there will definetly be chapters that are just fluffy and sweet (moral of the story im not just going to dehumanise autism and make it seem all super bad!)
TRIGGER WARNING ⚠️ there will be chapters with suicide, self harm, eating disorder ect
Series
- Part 1 of 2012 leonardo-centric
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how to sleep through the loudness: sedation by Averie_sol
Fandoms: Teenage Mutant Ninja Turtles - All Media Types
02 Jan 2024
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Summary
"Atleast i have a dad to run back to!"
...
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sleepless nights rise x 2012 crossover! leo hasnt being sleeping cause of the craziness, and has been forgetting to take his antipsychotics.
Series
- Part 11 of the stories of sleepless nights
- Part 13 of 2012 leonardo-centric
- Part 4 of Rise Leonardo-centric
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Summary
Leo shrugged, continuing to kick his feet back and forth gently. "Dunno, s' allll fuzzy. Not big blue," he explained, watching aprils face soften.
"Do you feel like a little blue, huh?" she asked, and leo nodded his head and chirped; april got it!
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another sleepless nights fic! ft. age regression
leo has been training like crazy recently, and april finds out, wondering why he trains so hard. talking about splinter and things that remind him of when he was younger make him all extra upset and stressed, so he slips.
Series
- Part 8 of the stories of sleepless nights
- Part 10 of 2012 leonardo-centric
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He's Working On It (Y'know, That Whole Coping Thing) by CallMeLittleSunshine
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types
14 Aug 2023
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Summary
Leo has a nightmare, and goes to his twin for some comfort. Chocolate milk, sleepovers, and snuggles ensue.
Series
- Part 1 of Turtle Tot Time !!
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A picture worth a thousand words by Werewolf_Origins
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
05 Aug 2023
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Summary
Leo has a mission of utmost importance that he absolutely cannot fail.
Aka Little-Leo has a suprise for his family!
Series
- Part 3 of Leo-centric TMNT 2012
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night skies and warming hearts by qi_agere_fluff
Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)
12 Jun 2023
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Summary
Leonela doesn’t have even the slightest idea what’s happening to her—she just feels so fuzzy and tiny all of a sudden, and it’s scary—so she decides that she should try to hide and hope that it’ll pass. Luckily for little Nellie, though, she has three doting brothers who DO know what’s going on, and who are more than happy to help take care of their sister.
Series
- Part 1 of ✨ ooey-gooey agere snapshots ✨
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MerMay Magic! by The_Lunar_Occult_Wrote
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
26 May 2023
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Summary
"He slide on his knees, grabbing the glitter glue, he started to use it to fill in his own mermaid tail. If he were a real mermaid, he'd have the sparklyest, shineiest, prettiest tail ever! It would be orange, and pink, and blue! Oh! And, it would have butterflies all over it, he just loves butterflies!"
Series
- Part 4 of 🍰Age/Pet-Regression Fics🎠
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Holographic Continuity by Anonymous
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Samurai Rabbit: The Usagi Chronicles (Cartoon)
16 Jan 2023
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Summary
Yuichi pulled him closer, one hand wrapped around him, one hand in his hair. “I’m sorry, Leo,” he murmured. “You’re okay. You’re right here with me. I won’t let anything happen to you.”
Leo sniffled against his throat, breath shaky, voice impossibly small when he asked, “You promise?”
Yuichi closed his eyes. “I promise.”
Or,
Leo has nightmares, and he turns to Usagi Yuichi.
(Quick note to say that they are written as humans in this fic!)
Series
- Part 1 of white flags oneshots