Leo doesn't cuss, at least, not in front of public or his father. He does curse quite a-fucking-lot around his brothers though. He tries to keep his composure and an air of superiority around his brothers because he's the leader & they should listen–but when it doesn't work he goes off on a "FUCK" rant.
Examples:
-what the FUCK WERE YOU THINKING
-Fuck off, Raph
-Get the fuck away from me
He once swore in front of Splinter, and got the most disapproving glare from his father that he had to send himself to the Hashi.
Donnie cusses, it's canon. He does like to say "ass", along with all the other colorful classics like fuck, damn, motherfucking hell; but I think his fave word (or the word he's used most) is "shit". Why? It's possible that Donnie, despite how smart he is, screws up sometimes and has to race for the fire extinguisher (not for the first time either), simultaneously crying out "shit shit shitshitshitshitshitSHIT!" He does cuss the most out of his brothers though, especially when one of the bros mess with his equipment.
Examples:
-*grumbling to himself* Great, fucking honor-boy with his katanas so far up his ass can't help but yell at me for shit the others have done.
-Stop stealing my shit Raph!
-MIKEY YOU FUCK GIVE ME BACK MY LAPTOP
Mikey's fave word is "Bitch". I totally see this muffin use the word "bitch" in an immature, comedic way. Don't get me wrong, he'd never call any woman that, he was raised better than that. He'd use the term to mess with his brothers best, and he uses it a LOT when he's playing video games, always cussing out the enemy boss and his goons. But, no one knows why Mikey always lovingly refers to his brother Raphael as a "punk-ass bitch", especially when Raph is peeved. It's very possible he's asking for a beating, but Raph never manages to catch him anyway so it's all fair game for him.
Raph has no favorite word. He cusses all day every day, his only exceptions are never in front of his dad, and April. His dad, because it's his dad and he'll tail-choke him, and April because April is the Hogosha and she's put up with enough shit from this family anyways so she at least deserves some form of modesty from him. He loves cussing out Leo the most, because Leo rarely cusses and it's always a great sight to see Fearless slowly lose his cool and start cussing out Raph back.
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DT Ninja Turtle Headcanons
Romance(18+) Just a work where I can publish all the ask answers I got on my blog. Chapters will pertain to different asks, and can range from long paragraphs to short answers. Turts are 2014/2016 renditions and are over 18+.