Here are some headcanons that I include only in parodies/comedic writings (like I don't actually headcanon these. Its just that they're funny)
● Kai hair reaches ankle length when it isn't gelled up.
● Jay has the ability to fly by flapping his legs.
● You must have noticed Zane being very shirtless some seasons, why? Because he has a very successful OnlyFans account and it's the ninja's main source of income. (They make only six figures by fighting crime but Zane makes nine figures 💅✨)
● Cole is married to cake.
● Jay is related to the mailman.
● Wu's beard is fake.
● Jay refers to his friends as "Babe" and refers to Nya as "Bro".
● The cloud under Nadakhan's torso is made of his own farts.
● Kai likes to sometimes style his hair into one giant spike and then he rams into people with it.
● The mechanic is a huge shipper of Jay and Nya and probably knows more about their relationship than they do. (Bro litteraly paused as he was about to kill them just to ask how they got together, in Crystallized. There's no way this man ain't a shipper)
Shidding toothpaste