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  1. *

    Softshell in Human Clothing by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)  

    04 Oct 2025

    Tags
    Summary

    Donnie has everything perfectly under control. Sure, sometimes he hears the voices of those who aren't there, and sometimes he's not in control of his own body- but those are easy fixes. He's fine, dare he say even better than fine! He's so fine that he even constructed a portal to other dimensions in case the Krang come back! It's not like he worked endlessly, almost obsessively, over the portal for days, missing sleep and family trying to talk to him.

    He's fine!

    He's even fine when the portal swallows him whole and spits him out into a new universe with nothing but his battle shell and clocking broach.

    One with alternate versions of him and his brothers, just starting out and fighting their own version of Kraang and bad guys. He's even fine when he gets dragged into their upcoming battles and fights. He's going to get home anyway; what's the harm in helping out his alternate family fight against Kraang?

    Or:
    Post-movie ROTTMNT Donnie gets sucked into Season 1 TMNT 2012.

    Language:
    English
    Words:
    112,410
    Chapters:
    30/?
    Comments:
    751
    Kudos:
    2,459
    Bookmarks:
    424
    Hits:
    60,777

  2. 74

    Loose Lips Sink Ships by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2003)  

    20 Jul 2024

    Tags
    Summary

    After Donnie returned from SAINW, he struggled to adapt back to normalcy. He was constantly overwhelmed and anxious. His family helps him as much as they can.

    But it doesn't get easier when Donnie realises that he hasn't spoken a word since he came home. And can't speak a word.

    (What if Donnie became mute after the sheer mess of SAINW. Please read disclaimer in notes)

    ...

    "Donnie tried to power through and say something. Anything. His heart thundered against his plastron, desperate to escape. His mouth flapped uselessly. He tried to force his voice into his throat."

    Language:
    English
    Words:
    38,216
    Chapters:
    6/?
    Comments:
    119
    Kudos:
    285
    Bookmarks:
    74
    Hits:
    4,414

  3. *

    A Genius Scorned by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2003), Teenage Mutant Ninja Turtles - All Media Types  

    17 May 2022

    Tags
    Summary

    “Donny—”

    Whatever Leo sees when Don looks at him stops him. Mikey seems awed, and Raph whistles quietly. Don wonders what he’s done to cause such reactions—and then Leo smiles, pride eclipsing the worry of an older brother.

    “We believe in you.”

    —

    In which the enemy underestimates Donatello—especially a Donatello that is hellbent on protecting his family.

    Language:
    English
    Words:
    2,547
    Chapters:
    1/1
    Comments:
    60
    Kudos:
    1,038
    Bookmarks:
    230
    Hits:
    7,104

  4. *

    salvageable by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)  

    01 Oct 2022

    Tags
    Summary

    It was Donnie's idea to come scavenge for all of his broken (useless) tech, but now he's just standing here staring at the scattered vestiges of what is essentially his life's work. All the time designing and building weapons, and for what? The Shredder tore through all of it like paper. Donnie put on a battle shell to come out, even though Leo told him not to because of the bruising, and it's starting to hurt. It suddenly feels like it's weighing him down, like his legs might collapse underneath him any second, and he can't move.

    "Donnie?" Mikey leans into his line of sight, looking worried. He grabs Donnie's arm and gives it a little shake, and Donnie's arm moves limply. "Are you stuck?"

    Donnie spends a good minute trying to get his mouth to work, "Y-yes."

     

    /Donnie hyperfixates on a thing (as one does) and gives himself a panic attack. Allegedly.

    Language:
    English
    Words:
    6,022
    Chapters:
    1/1
    Comments:
    45
    Kudos:
    1,313
    Bookmarks:
    288
    Hits:
    9,261

  5. 24

    Suffering in Silence by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2003)  

    08 Feb 2024

    Tags
    Summary

    The Ninja Tribunal’s vision was shocking to everyone—but perhaps more so to one turtle than the others. After all, for someone who has seen the death of his family once, seeing it again is more than a little traumatizing. 

    Series
    Language:
    English
    Words:
    1,131
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    170
    Bookmarks:
    24
    Hits:
    1,390

  6. 18

    The Price of Appreciation by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types  

    10 Apr 2025

    Tags
    Summary

    At the ripe age of five, Donatello had messed up. He messed up big time.

    He’d made a gift for one of his three brothers. Not unusual. That gift had malfunctioned, been wrong, or simply ill-received. Also not unusual. But he’d been upset. Unusually upset.

    He’d written an apology note, left it on his bed, and disappeared. He’d intended to come back after he’d learned what he was doing wrong. Why his many inventions and gifts weren’t good enough. He really had intended to come back eleven years ago.

    Until he’d found his way to Big Mama, who had thought his inventions were good enough. She’d told him his gifts weren’t the problem, he was. Donatello wasn’t made to be loved, she’d said. But he was made to be useful. To be appreciated. That’s what he recalled of that day.

    But Donnie can’t really remember anything from back. Though he never dwells on that. He has no reason to.

    Language:
    English
    Words:
    25,429
    Chapters:
    4/?
    Comments:
    30
    Kudos:
    80
    Bookmarks:
    18
    Hits:
    1,006

  7. *

    Two Halves of a Whole Heart by

    Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)  

    24 Oct 2019

    Tags
    Summary

    Whenever Mikey isn't feeling to great, he'll seek out his older brother.

    Language:
    English
    Words:
    3,711
    Chapters:
    4/4
    Comments:
    39
    Kudos:
    1,766
    Bookmarks:
    277
    Hits:
    21,342

  8. *

    Chomp (Or Three Times Donnie Bit Someone Accidentally, and One Time He Did it on Purpose) by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)  

    26 Oct 2022

    Tags
    Summary

    He was a scientist, a scholar, and a ninja above all else. He prided himself on his intellect, and the fact that his mind had saved the lives of his brothers countless times.

    But he was also a soft-shelled turtle.

    And soft-shelled turtles bite.

    Language:
    English
    Words:
    7,620
    Chapters:
    4/4
    Collections:
    12
    Comments:
    375
    Kudos:
    4,226
    Bookmarks:
    762
    Hits:
    28,826

  9. 24

    You Weren't Meant to be There by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2003)  

    29 Feb 2024

    Tags
    Summary

    Splinter had noticed that multiple times a night Donatello has gotten up, checking on each of his family members as they sleep. But as Donatello makes his third round of the night, Splinter decides it’s time to see just what is plaguing his son. 

    Series
    Language:
    English
    Words:
    1,708
    Chapters:
    1/1
    Comments:
    9
    Kudos:
    188
    Bookmarks:
    24
    Hits:
    1,461

  10. *

    death wish by

    Fandom: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)

    14 Sep 2024

    Summary

    title from baby boy by mother mother

    Words:
    212,790
    Works:
    9
    Bookmarks:
    205

  11. 21

    ALWAYS THE PROTECTOR by

    Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles (TV 2003)  

    13 Apr 2024

    Tags
    Summary

    Raphael was always the protector...especially for Mikey, and if it came to it, he would die for any of his brothers with no questions asked.

    So...what if he did just that?

    (3 CHAPTER ONE SHOT)

    COMPLETED :)

    ⚠️ WILL CONTAIN SWEARING ⚠️

    Language:
    English
    Words:
    12,180
    Chapters:
    3/3
    Comments:
    22
    Kudos:
    226
    Bookmarks:
    21
    Hits:
    2,827

  12. 5

    You can't help others if youre not able to help yourself (TMNT Donnie) by

    Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)  

    14 Feb 2025

    Tags
    Summary

    Donnie needs to finish this medicine for Leo... he's taking too long, he needs to be faster, because the faster he is the faster everyone else can be happy, and the faster he is the faster Leo will wake up... the faster he is... the more tired he gets of his failures. that is until Casey finds him curled up in his shell hiding fast asleep after not seeing him for two weeks.

    Language:
    English
    Words:
    2,913
    Chapters:
    1/1
    Comments:
    5
    Kudos:
    80
    Bookmarks:
    5
    Hits:
    783

  13. 2

    I Can't Handle Change - Roar by

    Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)  

    15 Oct 2025

    Tags
    Summary

    The turtles had seen plenty of unfortunate, painful mutations over the years. They just never thought they would have one of their own go through the same experience. But when Donnie saves Casey from a mutated fate, the genius is reborn anew as a turtle-alligator hybrid. Controlled by instincts and uncertainty, it will be a long and hard journey to return Donnie back to normal. But as time goes on, is that even a possibility? How much is Donnie willing to sacrifice to fix himself? Thank goodness he has his family and friends (and maybe more than friend Casey Jones) there with him.

    A 2012 "bimutated Donnie" au inspired by the "Good Genes" episodes of the 2003 cartoon, with Karai and Splinter being good family members, a friendship between Leatherhead and Donnie similar to the 03 show, and some endgame Jonatello.

    Language:
    English
    Words:
    961
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    7
    Bookmarks:
    2
    Hits:
    41

  14. 3

    is this something i can fix? by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types  

    08 Oct 2025

    Tags
    Summary

    There was just so much damage.

    Claw marks running down his plastron, a chip in his shell. His head was bruised badly but Donnie couldn't check for a concussion in this state, and there was a ring of marks around his neck that Donnie had patched up quick before they left April's. He was a mess of broken skin and bones and Donnie had never dealt with so much damage before. He didn't even know where to start.

    A moment in the truck, as they're on the way to the farmhouse.

    Whumptober Day 7: "Tell me that you're okay, and I'm fine."
    Trapped with the Enemy | Elevator | Pushed Beyond Breaking Point

    Series
    Language:
    English
    Words:
    1,177
    Chapters:
    1/1
    Collections:
    1
    Comments:
    2
    Kudos:
    35
    Bookmarks:
    3
    Hits:
    144

  15. 81

    Relatable by

    Fandoms: Teenage Mutant Ninja Turtles (TV 2012)  

    04 Aug 2023

    Tags
    Summary

    Donnie forgets that he isn’t alone with the feeling of being torn apart, that his brother Mikey was there too. (Even though he was vaporized by electricity more than having his atoms torn apart)

    That they can relate about their trauma.

    And also make jokes about it to mess with their older siblings, cause why not?

    Series
    Language:
    English
    Words:
    1,404
    Chapters:
    1/1
    Comments:
    18
    Kudos:
    693
    Bookmarks:
    81
    Hits:
    4,438

  16. 2

    Teenage Mutant Ninja Turtles, It Came from the Depths by

    Fandoms: Teenage Mutant Ninja Turtles (Bay Movies), Teenage Mutant Ninja Turtles (TV 2003), Teenage Mutant Ninja Turtles (TV 2012)  

    12 Oct 2025

    Tags
    Summary

    Baxter Stockman has been at large for six months, studying and plotting his revenge on the Foot Clan and on the brothers. To accomplish this goal, he soon learns must sacrifice more than just his humanity.

    Meanwhile, while the brothers recover, Michelangelo and Donatello discover something strange lurking in their sewer home. Something big, mean, and hungry

    Language:
    English
    Words:
    629
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    6
    Bookmarks:
    2
    Hits:
    92

  17. 2

    It's Okay, You're Okay. by Anonymous

    Fandoms: Teenage Mutant Ninja Turtles (TV 2012)  

    09 Oct 2025

    Tags
    Summary

    Donnie's anxiety gets the best of him after a tense situation.

    Language:
    English
    Words:
    705
    Chapters:
    1/1
    Collections:
    1
    Kudos:
    9
    Bookmarks:
    2
    Hits:
    156

  18. 43

    Making the River's Bed by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)  

    14 Oct 2022

    Tags
    Summary

    Under the calm shifting waters, the world was a faint dream. Forcibly quiet. Shielded away, the world could do nothing but scream at the calm, motionless, surface. After the Kraang Invasion, he experienced chronic, debilitating, back pain. A bad flare up causes him to recede into the waters of the sewer system; to hide away from the world. To cease feeling, just for a moment. Just...one...moment...

    As a soft shell, Donnie could breathe under the murky waters.

    Thus, those precious moments become a day and Leo comes to worry.

    OR;

    Donnie can't take the weight of the constant pain he feels, and he uses long sits under water to cope. Leo comes to comfort him. Vent Fic

    Language:
    English
    Words:
    1,742
    Chapters:
    1/1
    Collections:
    1
    Comments:
    12
    Kudos:
    446
    Bookmarks:
    43
    Hits:
    2,819

  19. *

    In This World (It's Just Us) by

    Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)  

    06 Aug 2025

    Tags
    Summary

    Donnie blinked at his counterpart.

    He looked rather plain to be a Donatello. Then again it was another universe, anything was possible. Donnie couldn't fault the turtle for his lack of..Well everything.

     

    Or; Donnie and Leo go to the 2012, and the 2012 have to deal with two superpowered, probably insane versions of Leo and Donnie.

    Filled with plenty of murder, laughs, more murder, disturbing imagery and Donnie/Leo awesomeness and alternate turtle gawking. Enjoy.

    Series
    Language:
    English
    Words:
    109,643
    Chapters:
    38/?
    Collections:
    3
    Comments:
    825
    Kudos:
    3,712
    Bookmarks:
    490
    Hits:
    115,100

  20. 82

    Will You Stay Here Forever? by

    Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)  

    16 Oct 2022

    Tags
    Summary

    Are you okay?” Leo looked puzzled, Donnie was the one who was sick, why wouldn’t he be asking if- 

    Donnie cut him off before he could finish his train of thought. “You look… Bad." Leo shut the cabinet of the mirror and saw… Himself, he didn’t look wrong, he didn’t think so. He turned to his brother who looked down at the hands clasped around the container of pills.

    “Your hands, they’re shaking.” Oh.

    -
    Or: Leo wakes up to Donnie missing. Naturally, he panics.

    Series
    Language:
    English
    Words:
    3,207
    Chapters:
    1/1
    Comments:
    14
    Kudos:
    996
    Bookmarks:
    82
    Hits:
    9,952

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