What Weapons Does Ninjago Kai Use Throughout The Seasons?

Man, Kai’s weapons are basically a fiery highlight reel — he’s that guy who loves swords and then finds a dozen louder ways to swing them. In the earliest seasons of 'Ninjago' he’s almost always carrying blades: twin katanas are his signature, the kind that show up in pretty much every minifigure and action scene. Those swords get a lot of spotlight because they match his hotheaded personality and fire element, and the choreography leans into fast, slash-y combos.

As the show progresses, the swords get variations and upgrades: flaming effects, energy-ish versions during the more sci-fi arcs, and occasional single big blades when a plot needs drama. Beyond straight-up swords, Kai’s used smaller throwing weapons (kunai/shuriken-style chips in the background), daggers, grappling tools, and improvised gear when a scene calls for it. He’s also been shown wielding other people’s weapons briefly — either borrowing a staff or grabbing something special for a mission — which makes sense for his impulsive, get-it-done vibe.

On top of handheld weapons, remember that Kai fights using his element, too. Fire blasts, flaming sword upgrades, and mecha or vehicle-mounted weaponry show up depending on the season. So while the core is swords (especially dual katanas and flame-infused blades), the full list across seasons includes throwing blades, short blades, tech/energy upgrades to his swords, and the usual assortment of ninja tools when plot convenience demands it. If you’re collecting Kai figures, look for the dual katanas and the flame blades — they’re basically a cheat code for “this is Kai.”

I’ve watched enough episodes of 'Ninjago' to notice a pattern: Kai loves blades. His go-to is almost always some form of katana — frequently a pair — and the series treats those blades as extensions of his fire powers. Over time the swords gain visual upgrades: flames, glowing edges, or tech-style energy, depending on the arc.

Outside of swords, he’ll use smaller ninja tools (throwing stars, daggers, kunai) and sometimes grabs whatever weapon the situation demands. There are also moments when he fights using elemental fire attacks or from vehicles/mechs where his usual swords are either mounted or translated into other weapons. In short, if you’re listing what he uses across seasons: primarily katanas and flame-infused swords, plus the usual ninja throwables, short blades, occasional borrowed weapons, and tech/energy variations introduced in later seasons. I usually judge a Kai scene by how flashy his blade looks — it tells you a lot about the episode’s tone.

I still get a little giddy thinking about Kai’s weapon wardrobe — it’s very much swords-first, with spicy variations. Across 'Ninjago', his primary weapons are katanas: sometimes twin blades, sometimes a single dramatic sword when the scene wants to emphasize emotion or power. Early seasons stick to classic samurai-style swords; later ones dress those blades up with flaming or energy effects.

He doesn’t only slice with swords, though. Throwing stars and kunai-type tools pop up in skirmishes, and I’ve noticed him using short daggers in tight spaces. During the more technologically flavored arcs, the blades get tech overlays — glowing edges, energy trails — and he’s occasionally shown in mechs or vehicles where his swords are mounted or he uses ranged fire attacks. Also fun: Kai grabbing a teammate’s weapon in a pinch, which says a lot about his improvisational fight style.

If you’re cataloguing or collecting, the consistent picks are: dual katanas, any flame-themed sword variants, and the occasional specialty blade from a particular episode or LEGO set. I like collecting the versions with translucent flame pieces — they capture his personality perfectly.