Masaki here (03524) is simply a wonderful, clean, dynamic sculpt, and a perfect foil for O-Sayumi (60191). While you were learning the virtues of the carp, he studied the BLADE.
Did some image searches for Edo-period prints of storm clouds, lightning, and rough seas. Not perfectly satisfied with the ocean aspects of his robe, but the lightning and clouds will do for now.
Click for more angles:
"Again we meet! So, the shogun sent you to kill me. He chose assassins well. Your strikes--swifter than the winter wind!"
"And yet no swifter than you parry! But no, Masaki. You fight like twenty wolves. The shogun would never have you killed."
"Then who?!"
(If there's one thing the genre teaches us, it is that this will not go well for Masaki.)