Regardless of base, Akagi will always be Akagi it seems. Not that I'm complaining.

Who writes in red and who writes in black ?

Seika said:

Who writes in red and who writes in black ?

I think we can assume the black is one's relationship to the other and the red is the correction by said other person. That seems to be the case with Zuihou and the loli Zuikaku base's Akagi and Kaga.

Zuikaku's face in the lower left corner...