Let me guess, right is Akagi left is Kaga.. gee.. almost exactly like Azur Lane.
Kancolle, Warship Girls, & Azur Lane all have a “Kaga = blue, Akagi = red” scheme, although Kancolle is the only one that has Kaga with a different hair color. “Akagi = red” makes sense since Akagi means “red castle” but I don’t know why Kaga is blue...
However,Design of warship girls Akagi appeared much faster(It appeared in 2016.12.8) than Azur lane's akagi. I heard Kaga design also much faster,But some problem made the design to appear late.
“Akagi = red” makes sense since Akagi means “red castle” but I don’t know why Kaga is blue...
Red Oni (associated with passion) and Blue Oni (associated with serenity) pairing is rather old trope. You could say that Kaga was simply given color scheme that would contrast her red partner the most than anything else.