Well, yes, I have a husband and two little sons who love Lego and Ninjago. And I was challenged to recreate the Ninjas in Pathfinder.
Well, one starting point was the kineticist without a doubt. My eldest absolutely loved that class from the start and associated it to the Ninja's elemental powers. After some thought, I discarded the Elemental Ascetic archetype. It can deliver only touch elemental attacks, while we want to fire rays too.
The Pathfinder ninja wasn't a great choice. Too much stealth, too few flashy powers. We want a monk. Plus, he needs to be able to deliver elemental attacks with his weapon, and to make a Whirlwind Attack! Ninja-Go!
So I decided for a multiclass Vanilla Kineticist/Qinggong Monk with the Ascetic combat style chain. Since the Kinetic Fist wild talent is an ability that "improves unarmed strike", the style feats should allow the characters to use it with their weapon of choice.
What do you think? Could I do something else to go even nearer to the show characters?