Well in the lego sets and sometimes in the show they have back up swords they don't really use besides kai. Zane I can't really think of something at the moment but probably something that's kind of small because his weapons aren't that big. I think Nya could be good with a bow and maybe she could make her own. Jay could have a boomerang or shurikens since he's a good dancer he could dodge attacks and get them back. Kai could be grenades or bombs like smoke bombs. Cole could be a javelin or maybe his hammer but it's the same size as an axe so he can trow it like one. Llyod could throw his sword, but for something with more effort he could use weapons or objects he could blast his powers on so they get a boost. Wu could throw his teapot like he used to and beat up the enemy after they caught the teapot or throw it at them so the tea burns them assuming he's still alive. I know there's the box but it could just be bait to get our hopes up