WE KNOW ALL THEIR NAMES! WOOOO!!!
Okay, so I'm going to try and break them down and see what inspired their names and designs a bit.
ST Jaygarcia Saturn-Defense Science-Karl Marx/Giuseppe Garibaldi/Jerry Garcia-“Horns”-Dosei Earth Planet
ST Shepard Ju Peter-Agriculture-Abraham Lincoln/Jean Shepard?-“Scream?/Blob?/Frog?”-Mokusei Wood Planet
ST Topman Warcury-Justice-Mikhail Gorbachev/Topman Baba?-“Tusks”-Suisei Water Planet
ST Marcus Mars-Environmental-Itagaki Tasuke/Marky Mark?-“Bird”-Kasei Fire Planet
ST Ethan-Baron V Nusjuro-Fianance-Mahatma Gandhi/Hideki Tojo/Ethan Bortnick?/ “Eisenbarren” or Bar Iron-“Human/Snake”-Kinsei Steel/Gold Planet
Imu Nerona...we know Imu's family name! There's actually a good breakdown of all of this in this video:
Okay, so far, it seems like all the Gorosei's designs are inspired by political leaders from around the world. There's some debate on who's who, but they're likely famous former "freedom fighters" from around the world.
Their NAMES on the other hand, seem to be possibly inspired by other types of celebrities. Jaygarcia is mostly likely a reference to the musician Jerry Garcia. I'm not sure if they're ALL supposed to be musicans, possibly tying them to the song Bink's Sake. Or if they're other types of famous people. A famous chef, and a famous swordsman, for example. "Topman" kind of stands out as a strange name, but I WAS able to find a match to a Nigerian rapper, so maybe they ARE references to musicians from around the world? If so...could Marcus Mars actually be a reference to...Marky Mark and the Funky Bunch?!
Also, the Japanese names of the planets are different than the English names we all know. They're based on the Asian five elements. For example, Saturn is called Dosei (The Earth Planet) in Japanese. These MIGHT help identify what they're Devil Fruit forms are.
Also, while researching some of this, I noticed that the Japanese word for the sun is actually Taiyo. Which...sounds a lot like Taiko, as in the drum...is that where the "drumbeats" of Luffy's heart come from? Also the word Taiyo can mean both "sun" and "ocean"....so that's a interesting little factoid. Is NIka actually the ocean-god we've all been waiting for?
en.wikipedia.org
I also want to point out that there's a group of Chinese Deities that seem to match up to the Gorosei reasonably well. The Wufang Shangdi aka the Five Faces of Heaven. It's not perfect, but it's still pretty good.
en.wikipedia.org
Saturn-Yellow-Huangdi-Center-Big Dipper-Shaman/Hero/Dragon/Light/Thunder/Four Faces
Jupiter-Bluegreen-Cangdi-East-Wood/Spring/Fertility-Dragon
Mercury-Black-Heidi-dark warrior-North-water/winter-black dragon-tortoise snake
Mars-Red-Chidi-South-Farmer/ Flame/ humanity/ agriculture/ market/ science/craft/ doctors- phoenix
Venus-white-Baidi-West-metal/autumn-tiger
(Yes, one of the gods really IS named Heidi).
The most interesting thing about this group, to me, is that they each have TWO animal forms. A colored Dragon form...and a Stellar Animal form. They're basically the four guardian beasts you may already be familiar with from other anime. (Dragon, Phoenix, Tiger, Tortoise). But, I find it interesting that the Gorosei actually COULD have TWO animal forms. These guardian beasts and a dragon form. And having a second stage where they transform into a dragon could be cool and fitting for a manga that's been teasing dragons for so long.
Some of it's just that both groups represent the planets, so they have some similarities that way. But, it's possible there's a deeper influence, too.
Some other random thoughts about this chapter:
I'm guessing that Vegapunk made the Mother Flame in order to help warm up his home island of Karakuri, like he promised he'd do. It's a winter island, I could see him making a miniature sun to help them make it warmer year round, so they can grow more food. It just got repurposed without his knowledge by the World Government into a super weapon.
I kind of wonder if it's possible that the shadowy shapes the Gorosei took on where actually a new type of Haki? Imu's Haki? Or possibly, some sort of...Anti-Haki? If Haki is the form someone's willpower takes...then ACCEPTING your fate might have a power all it's own, too. The power of despair? I don't know, just something I'm mulling over, it's probably just shadows to hide the reveals for the real designs.
This is kind of a big one....I'm starting to think that Imu is actually a immortal child. There's just something....childlike in the way she plops down in the Empty Throne. And wants to hear about her "old friend". Like Lili was a babysitter that she wants to see again, or something. I don't know, it's just a vibe I'm getting. Plus, it DOES seem like Imu's probably MUCH shorter than we were lead to believe at first. I'm guessing Imu's a child that never grew up, for one reason or another. The other Celestial Dragons COULD then be her old playmates...but they grew up and she never did. But, she's still willing to do ANYTHING for them, no matter how cruel...kind of like a dark mirror of Luffy.