Regarding Vanilla's blog...

As for your question on how other planets move... well, for Neptune (I'm sure you're well aware of this since we're neighbouring planets after all), we have who ever carries the royal blood lineage. We have 'district rulers' as you put it, as well. Each country has their monarch/leader/ruler. But the very control of the whole planet belongs to the Royal Neptunian family (RNF). And then there's this 'marrying off to the RNF". It's quite weird, 'cause as royalty, we'd want to keep our bloodline solid so that we'd only have one race ruling the planet. But then I don't know why, for some reason, we don't do that. As time pass by, the ruling families change every now and then. Other monarchs from other countries, of course, would target the current heir to the throne so that their race would be the next ones to rule. It's really complicated.

As for prophecies. Well, out of all planets in the Milky way, I think Neptune is the most traditional. We have lots of tradition and believe in lots of stuff (which is SO opposed to Pluto's non-believers). I know, once a prince/princess or the RNF is born, specially the heir, an oracle will visit to give a prophecy. I think my mother's prophecy was that she'd be marrying into an Elven family. Which is why she hates Elves. Merpeople have been ruling Neptune for quite a while now. So I guess for an heir to marry into another race, you'd definitely not want to give the opportunity and the hard work your ancestors did. 

For us, our prophecy has been locked by my father. I was told by my 'grandfather' that it wasn't such a good one and it's better not to know. I don't really care though. As for legends. There are quite a ton of them, depending on the country. One universal legend we have is the Weaving maiden festival/Star festival. We believe in the stars A LOT. It's sort of like Valentine's day. Meeting your loved one and spending time with each other. Quite a sad story but yeaaah...

And for the others...I'm too lazy to put it. Oh right! We used to have priests and priestesses before. Perhaps around Neptune's early days. Now they're extinct and nobody really needs them now since there are oracles.