NinjaNekosLibrary
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Summary
He punched her.
Nobody moved when his fists met her jaw, or when she fell, landing hard on her back.
“DUDE!” Casey flew to her side; the first to comprehend the situation, to live in a world where Donnie would hit April.
It took his brothers another few seconds.
Leo still has a hard time believing it.
Mikey had gotten between them. Leo and Raph grabbed his arms. Donnie didn’t fight them.
He looked as shocked as they felt, stunned in a way that rounded his eyes and laxed his muscles.
He stared, as Casey helped her to her feet and took her to the kitchen. Motionless when they tried to find out what he was thinking, doing that to her.
“It worked,” He admitted, slow and soft. “I didn’t think it would work.”
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Arc One: The Battle by NinjaNekosLibrary
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)
13 Jun 2026
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“It’s a nickname. Short for Donatello.”
“Heh.” He quirks a smile. “Kinda a coinkydink ‘cause-”
“Hamato Donatello.” Leo’s head shoots up and the turtle looks back. “My brothers are Leonardo, Raphael, and Michelangelo. They have nicknames too. Mikey, Raph…” He tilts his head, urging, “Leo.”
Leo stares, looking for any sign of deception. The turtle keeps talking, almost as if he’s trying to get the words out before his brain can catch up. “We’re a team. We fight crime and save people. I have a father. We call him Splinter. He’s a rat. Used to be a human. Adopted me and my brothers, taught us ninjitsu.”
Leo’s paralyzed. He waits for the snickers, or for the punchline.
The turtle does not shirk away, eyes bright with the maniac look that Donnie gets when he proves a theory correct and is dying for a single person to acknowledge that he’s the smartest being on planet earth.
“So. Leo.” It’s conversational, calm, eager. “What’s your family like?”
(Or, A crossover where 2012Donnie is sent by Za-Naron into the Prison Dimension and joins RiseLeo during his stay. ✨ And they bond. ✨)
Series
- Part 1 of Mismatched Twins
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Everybody in the world knows I'm a little by NinjaNekosLibrary
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
07 May 2026
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Summary
Raph's philosophy may not make sense to everyone, but it makes sense to him.
Or,
Raph knows his reasoning can be a little twisted, but if it means his brothers can make it through the night, then he's happy to do whatever it takes to whoever needs it to make that happen.
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Summary
He keeps going on and on, and Leo trails behind him when he starts moving and gesturing and hopping on two feet, losing track when he spirals into some tech jargon. Leo momentarily forgets where he is, watching his little brother’s eyes shine, and debating the soft, curious thought asking how often Donnie spends his time focusing on Leo when Leo doesn’t bother to take the time to wonder about him.
Series
- Part 8 of Stolen From Tumblr
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The Hanging Three by NinjaNekosLibrary for RayInTheBackrooms
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
19 Apr 2026
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Summary
Red knows that he's one of the many scums of the earth. He knows that he's only at the bottom of the list because he hurts those who deserve it. That's what he signed up to do, undemocratic interrogations that lead to taking murderous vermin off the streets before they can wipe out any more living souls. Donatello was playing hardball, but Red was far more experienced at this game. He was going to get that confession, settle his conscience, and kill the cocky freak.
That was the plan anyway.
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When Red realizes that they kidnapped the wrong guy, he starts to wonder if his view of the world might be a bit skewed.
[For this fanfic to make sense, it heavily relies on the fact that you read 'The Turtleman' by RayInTheBackrooms BEFORE you read this one. There’s a link over the notes portion if you want to check it out!]
Recent series
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Stolen From Tumblr by NinjaNekosLibrary
Fandom Tales of the Teenage Mutant Ninja Turtles (Cartoon 2024), Teenage Mutant Ninja Turtles (TV 2012)
25 Apr 2026
- Words:
- 10,851
- Works:
- 8
- Bookmarks:
- 3
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TMNT2012 "I Fixed-It!" Series by NinjaNekosLibrary
Fandom Teenage Mutant Ninja Turtles (TV 2012)
20 Dec 2025
Summary
It’s about time some holes in this TMNT Universe were mended, don’t you think? Feel free to tag along with me as I heal all the hurts and fix the cracks left behind!
- Words:
- 51,287
- Works:
- 6
- Bookmarks:
- 59
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Mismatched Twins by NinjaNekosLibrary
Fandom Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)
13 Jun 2026
- Words:
- 16,955
- Works:
- 1
- Bookmarks:
- 12
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Wdym stories have… Endings? by NinjaNekosLibrary
Fandom Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)
31 Jul 2025
Summary
Any stories within this series probably don’t have planned endings.
They might just sit unfinished forever.
This is your official warning ⚠️
- Words:
- 8,461
- Works:
- 2
- Bookmarks:
- 2
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- Words:
- 3,813
- Works:
- 2
- Bookmarks:
- 2
Recent bookmarks
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Think by Hello_fandoms
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
30 Jun 2026
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Summary
It started while he was getting the antiseptic.
A feeling like Donnie's mind wasn't only connected to him anymore.
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Essentially a rewrite of The Creeping Doom with more angst and comfort.
Series
- Part 1 of TMNT Fics
Bookmarked by NinjaNekosLibrary
27 Jun 2026
Bookmarker's Notes
Man why couldn't the episode have done THIS???
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Summary
“hamartia (noun): a fatal flaw leading to the downfall of a tragic hero or heroine.”
Donatello was irreplaceable. He knew that for a fact - he had built his own worth up so high, there was no way anyone could fill his seat at the table. There was one thing that Donatello would never be; that he would never LET himself be. He would never be a liability.
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Or: Donnie loves himself, but he doesn’t like himself, and it takes him being critically injured for anyone to notice the difference.
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Boymon in Training by SunsetMagpie
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
23 Jun 2026
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Summary
When Master Splinter falls sick with the flu, he puts April in charge of the turtles.
Series
- Part 18 of The Reed Pipe
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TMNT: Draconic Mutation by OnyxtheHedgehog_15
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
18 Jun 2026
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Summary
Leonardo, a once-proud and confident mutant turtle, is subjected to an unexpected mutation and struggles to find himself as he comes to terms with the heavy fog of his new form.
Even when his new and old instincts constantly clash.
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Transformers Prime: War Collision by OnyxtheHedgehog_15
Fandoms: Transformers: Prime, Teenage Mutant Ninja Turtles (TV 2012)
08 Jun 2026
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Summary
Leonardo, Raphael, Donatello, and Michelangelo unintentionally get caught up in a war between two factions of transforming robotic organisms and are put under Optimus Prime’s protection.
But what they won’t expect is that their presence has already caught Megatron’s attention.