How I think the Ninjago characters would swear PART 2! (Mostly because I forgot pixel)
Pixal: Haha, no. That girl does not swear. Borg never programmed it into her, and even when she gained free will and consciousness, she simply chose not to. She finds it to be a crude form of language but often associates it with the ninja.
Derek: I honestly don't think he does, nor does he have it in him. Maybe at some point in his life, but I also believe Derek's life changed completely when he started the Dojo and met the Ninja. Now he just chooses not to swear.
Misako: I feel like she does. I also feel like she makes fun of Wu for say 'Snickerdoodles' instead of shit.
Akita: Only when she's truly pissed. She probably looked at the Ice emperor and said 'Fuck you bitch' which lead to a verbal gasp from her brother.
Garmadon (Evil vrs): Totally. But he was that one kid who would swear behind closed doors at his dad and brother, which also earned him soap in the mouth. Only later in life after stubbing a toe and say 'Aw shucks' did he realize he was a grown ass man and could as fuck if he wanted to.
Garmadon (Good vrs): Just like he took an oath to not fight, he chose not to swear, finding it a crude form of speech. But when all bets were off when Pythor kidnapped his son he truly meant ALL BETS
Let me know if you want make because I love making these
As always, these are just my Headcannons. Feel free to leave yours in the comments.