Jonatello

Jonatello is the slash ship between Casey Jones and Donatello from the Teenage Mutant Ninja Turtles fandom.

Season 2
FUNGUS HUMUNGOUS

Casey goes to the turtles and tell them that April got freaked out and ran off, causing him to lose her. Donnie becomes angry and has Casey lead them to where he lost her. Casey is pretty sure they've reached where he lost April, but Donnie become mad at his vague wording. Casey tells him to back off, calling him "stick master" and Donnie responds with calling him "puck head". They glare at each other, but Leo interrupts to say that they don't have time for all their posturing.

Season 3
RACE WITH THE DEMON

As they drive back from the grocery store, Donnie questions why he always needs to be in the back, and Casey says that someone needs to make sure that the eggs don't break. Donnie points out that they don't buy eggs because they have chickens. Donnie points out that Casey always gets to drive and "questions" why. Casey says it's because Donnie driving would be suspicious, when April breaks. She tells them she'd like one trip to the store where they don't fight and the two fall into silence.

The next day, they're both working in the barn and Casey rudely asks Donnie to pass him a tool and Donnie mindlessly does so. Insulting him, but Casey catching it easily. Casey says the cars almost ready, and calls Donnie "Kraang Breath". Donnie points out that Kraang starts with a K, and Casey asks who decided that. Donnie says the Kraang and tells him to come up with another c-word. Apparently playing an alphabet game with their insults to each other. Casey suggest they take it out for a test run. They do so and Donnie times how fast the car can go, impressed with its speed. Raph says that he's almost impressed with what Casey and Donnie pulled off, when Donnie notices that Casey isn't stopping.

Donnie, Raph and Mikey catch up to him after Casey has a run in with the maniac driver. Donnie is mad that Casey trashed the car and went after the driver, but Casey thought he could take him. He also found out that the driver is a mutant, but Donnie says that he could have helped. Casey says the guy challenged him, and had to take him on one on one, but Raph interrupts to say they need to get the car back. Donnie glares at Casey, before heading back to the van.

Casey is working under the car, and Donnie sarcastically asks if he found the problem with the clutch. Casey says he found a problem and throws one of Mikey's chickens out from under the car. Donnie ignores him and walks to his work bench, starting to work with the mutagen. Casey feels awkward and says that he's sorry for going after Speed Demon without him, but Donnie says it's fine. Casey says that the "Hot Rod" is the best chance of bringing the mutant down, and that they need to team up on this. Donnie doesn't know, but Casey says that he needs Donnie's scientific genius and gives him a sweet "please". Donnie gives in and says that he has an crazy awesome idea.

He takes Casey down to the Kraang ship in the basement and strip it for parts, creating an engine. When it's almost finished, Casey says it's amazing and Donnie says he knows. He starts to fix the problem with the AI system, when one of Mikey's chickens comes in and gets mutated with a higher intelligence. And will be the one to control the car, Casey and Donnie fist-bumping over it being finished.

When it turns out the car is the mutant, it ends up taking over Donnie. Speed Demon drives past Casey and he sees Donnie in the drivers seat. Everyone else catches up to Casey and Leo asks what happened. Casey says that the car has Donnie, and Leo says that they need a plan. Casey says that he has one, get Donnie out of the car, and takes off. He catches up to it, and yells for it to let Donnie go, but Speed Demon says that Donnie belongs to him now. After they spin out, Speed Demon offers him a deal, if Casey wins, he gets Donnie back, but Casey looses, he becomes a part of Speed Demon. Casey agrees and they race.

Casey is eventually able to get Donnie out of the car, and he returns to his former self. Casey asks if he's alright and Donnie says that he thinks he is. They then hear the sound of the car, and it threatens to take Casey. Donnie pushes Casey out of the way and attacks the car. Telling it to leave Casey alone, but is thrown to the side. Luckily the turtle van arrives and it knocks Speed Demon into over a cliff and it explodes. Casey and Donnie high five, and April hops out of the van. She's glad they're okay, and finally getting along. Donnie and Casey then start to gush over how cool the high speed chase was, and hug as they do so.

Season 2
Mutagen Man Unleashed
 * Donnie sees Casey at the park and becomes jealous.

Target: April O'Neil 
 * Donnie becomes sad when he sees April hug Casey.

The Good, The Bad, and Casey Jones
 * Donnie spots Casey sneaking into the lair.
 * Donnie grabs Casey when he tries to attack them.
 * Donnie says that with Casey joining them it will be like having two Raph's.

Fungus Humungous
 * Casey and Donnie both purposely bump into each other, to annoy one another.
 * Donnie says it felt good to push Casey against a wall.
 * Donnie imagine April being into Casey as part of his worst fear.

Season 3
Race With the Demon
 * Donnie mocks Casey's overconfidence when they're knocked to the side of the road.
 * Casey becomes jealous over April giving Donnie a neck massage.
 * Donnie angrily tells Leo that Casey went after Speed Demon again.
 * Casey brings Donnie a caffeinated drink to keep them both going.
 * Donnie and Casey show off the Turtle Racer.
 * Donnie reminds Casey to stick to the plan.
 * Donnie corrects Raph's assumption on Casey ditching them.
 * Donnie calls Casey and tells him that they got Speed Demon.
 * Casey tells Speed Demon that he doesn't care about winning the race, he just want Donnie back.

Fanon
Initially a rarepair in the TMNT fandom, Jonatello started to gain a following during the 2012 series and became one of the most popular ships of that series. Due to the two being romantic rivals for April, many started to ship the two. As a common solution to love triangle's is to get rid of the axis and have the two opposing rivals date each other. Many noting that Casey and Donnie got along as along as they weren't fighting over April. While initially starting out as a joke, or the love triangle solution, many started to genuinely ship the two after the episode "Race with the Demon". Many noted how much the two acted like a couple in the episode. That Casey running off and abandoning Donnie caused the two to act like a couple with marital problems. A typical trope in art and "incorrect blogs" is Donnie being completely confused as to why he finds Casey's idiocy attractive.

On Ao3, Jonatello is the eleventh most written ship for Donnie and the third most written for Casey. It is also the tenth most written ship in the Teenage Mutant Ninja Turtles (2012) tag.

Fandom

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Variations

 * Capritello refer to the ship between Casey, Donnie and April O'Neil
 * Ninja Turtles & Capril — the ship between Leonardo, Raphael, Michelangelo, April O'Neil, Donnie and Casey
 * Ninja Turtles & Casey — the ship between Leonardo, Raphael, Michelangelo, Donnie and Casey Jones