My Nagas are built around a single lore-based concept: for the four-armed Nagas, there is a separate combat technique called "four waves"; in the game, this was an ability that granted additional attacks.
Kensei is a rare mutant, so I had to choose another Naga who would have 4 arms by default. In the sixth installment, it turned out strangely; everyone calls Sanctuary the city of Nagas, and the only Naga (not counting the Medusa) is a warrior with a rare genetic mutation; it's some kind of nonsense. A Naga should be an average specimen.
The idea arose about a mad Daimyo rebel who made a deal with a Crimson Mage to turn two-armed Nagas into four-armed ones (I eventually discarded this idea; it's too specific a situation and too impossible). Then I leaned towards the idea of cursed Nagas, but that's also strange: the curse gave all Nagas, in addition to the snake head, a boost in the form of extra arms, and then I just gave up on the lore of Heroes of Might and Magic).
The name Kabukimono is a remnant of the original concept: I was simply creating Kensei mercenaries in bright clothing, and the second one was supposed to be a bloodthirsty Kensei outcast who had no place in the peaceful Lotus Empire, but he still retained some loyalty. He was an exiled legion; the flags on his back were supposed to be the legion's banner, but now these are snake-headed Nagas who are not found in the Lotus Empire, and the story is no longer relevant.