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I have this really crazy/stupid idea concerning pic related. What if klk was set in feudal Japan? And the kamui were demon armor? Satsuki would still get Junketsu but like Senketsu at first, it isn't at full power yet hence the black color scheme, but as the "being worn by me and not just forcing it on" comes into play, it turns pure white, thus truly befitting of the name Junketsu and enables Satsuki to utilize its power to the fullest.
Stupid I know but I just wanted to share.