i wrote a whole fic about minoharu sun/moon dynamics (minori as the sun, haruka as the moon who is able to glow thanks to her) and i think it works quite well, but in general i don't think that really exactly communicates their dynamic. what i like about it though is that the moon is surrounded by stars, and the sun is but a star: minori is ordinary, one of haruka's fans, but she has a special quality that makes everything glow, and is positioned just right across from haruka so that haruka can glow because she's there, and so haruka is so grateful and touched by her presence.

i think the sea is an important symbol in their relationship, with the obvious imagery of "the sea of blue lights" in the main story/minori3 as well as that being their 3rd kizuna rank title. haruka looking out over it, and minori being part of it. that "sea" that has connected them since before they even got to know each other personally (hence it being their 3rd kizuna title), having already been by each others' side somehow. that being said i think of them on either side of this "sea" rather than one of them being the sea because really, both of them are. i guess if i had to choose it'd be minori as the sea but in that case, what's haruka? land? the sun? the sky? none of these jump out at me.

to be honest, i've been thinking about this for like ten minutes, and i don't think there's really any celestial assignment that fits them absolutely perfectly. i think more more jump might be like a constellation, four stars connected by invisible lines that together form an image representing a myth. minori might be the brightest star in this constellation, or maybe the star in the middle. maybe. minori is also an angel, and i'm sure haruka is something in comparison to that: someone she's been sent to protect, someone who looks up to her somehow whether that be something akin to religion or not, et cetera.

if anyone has any theories, feel free to let me know! i'm curious