Just like I did with the DB rolls, I'm going to do the same with the Sovereigns. Gwai's stats are already set in stone, but I'm largely going to invent some new characters here for the rest. If a character's stats are similar to those of a canon character, then I'll just use that character instead. That way, I can lessen the work on myself to create some new people.
First, Aspects. Sovereigns have Five Aspects (Diamond, Emerald, Opal, Ruby, Sapphire) which provide different types of Anima Banners, but largely does not change their potential skillsets. I'm assigning Gwai as a Diamond since they fit the most with his personality (Stoic, Virtuous, Resilient), meaning that we have 1 Sovereign per one of these other Aspects. Once I do the rolls, we'll see how that shakes out.
First is their proximity to you in terms of blood. After all, if you were to suffer a sudden death, Gwai might potentially be your successor, or Mobolaji, but after them the chain of succession might get a bit messy. We have canon Sovereign characters who are the Great-Great Grandchildren of Queen Ulu, so I'm going to be using a d4 to determine their generation from the Queen. 1 is the same generation as Sango and Gwai, but they might not necessarily be siblings, they could be those who married into the family (which is rather common in Uluiru). 2 is the generation after that (the grandchildren), 3 is the great-grandchildren where Queen Ulu's former heir Nuwa came from, and then 4 is the great-great-grandchildren. Hope that clears things up a little. For now, the rolls!
Result: the Opal and Ruby Aspects are of the first generation. Emerald is a grandchild, and Sapphire a great-great-grandchild. Ignore the 5th die roll, it was a mistake. Next, I'm going to roll d2 for all of them to see if they were born or married into the family. 1 is born, 2 is married.
Further Result: Emerald and Sapphire were both born into the family, while Opal and Ruby married into the 1st Generation. That checks out for me, if Queen Ulu wanted to help solidify tribal alliances with her family.
Next is the best stat. For this, any stat can be the best so I will use a d7, but some might syngerize better with Sovereign Charms than others. Intrigue in particular is going to be much more socially-oriented than sneaky, while Diplomacy might be more connected with music. It's just the way things can be sometimes.
Result: Emerald and Ruby are both Piety-focused (which is great for you!), Opal is Intrigue (also great), Sapphire is Diplomacy. Altogether, a really good set of rolls here, because it covers some much needed weaknesses you had.
Finally, the worst stat. Obviously each character's best stat won't be included here, nor Combat because, again, Exalted. That leaves 5 possibilities for each Sovereign.
Result: Emerald is bad at Martial, Opal and Sapphire are both bad at Learning, and Ruby is bad at Stewardship. Altogether not a bad result, considering the Dragon-Blooded you already have as candidates. The only Ministerial position you don't have a good choice for is ironically Records/Learning, so you might need to chip in yourself to help a lot in this category.
Actually... you know what, later on I'll roll for your Sorcery students to see if they would make good advisors, they'll probably be important anyways. That way, I don't have to also invent a bunch of random mortals to see if you could slot those in.
Regardless, our Sovereign Characters are:
Thousand-Hours Gwai, the Diamond Aspect eldest son of Queen Ulu. His best stat is Stewardship, being Queen Ulu's advisor and counterbalance for many years. Despite her being his mother, he was often the one to tell her "No" when something was stupid. His second-best stat for the sake of convenience is Martial, allowing him to serve as a pretty good general if you don't want to entrust your armies over to a Dragon-Blood. Finally, his worst stat is Diplomacy, he is just not a people person in any way, shape or form.
Next is our Emerald Aspect granddaughter of Ulu. The Emerald Aspect is all about desires and knowing how to fulfill them, both your own and others. They are the ones who entered the Fount of Glories in order to fulfill their Ambitions and retained their focus on those goals. Having an Emerald Aspect be Piety-focused is a bit odd, but perhaps she is better able to intuit the desires of the gods than most people can. But her hedonism and likely laziness means that she's not a great fit for leading an army, with how bad her Martial stat is likely to be. She is also a Sorcerer, with her Control Spell "Unslakable Thirst of the Devil-Maw" giving her a mouth on the palm of one hand which drains moisture out of those it touches.
After that, we have your first sister-in-law, the Opal Aspect. Opal Aspects have the unfortunate burden of cracking mentally when they bathed in the Fount of Glories, inflicting them with just a tiny touch of the Wyld. This might manifest as a mental illness, or as a predilection towards trickery. Your sister-in-law fulfills the latter to a tee, being a little gremlin that somehow managed to earn the love of one of your now-lost siblings, before marrying them and earning the Queen's respect enough to earn Exaltation. She would be a fantastic advisor with her knowledge of Intrigue. With her spouse dead either now or in the past, she might be trying to deal with the sorrow in some hidden fashion, not wanting to expose her grief to the world. Sadly, her dash of the Wyld also meant that she's an ADHD-ridden mess, preventing her from excelling in any scholarly field, meaning that Learning is a bust.
Then your other sister-in-law, the Ruby Aspect. Ruby Aspects tend to be the most emotional of the five Aspects, having used their fear or rage as a shield against the agony of Exaltation. Your sister, just like your niece, is focused on Piety, again a pretty odd combo, but she likely makes up for it through sheer passion. Unfortunately, thinking with her heart so much has left her finances in poor straits, as seen with her Stewardship stat, so you probably shouldn't give her any big loans in the near future. Her own spouse was also lost, and unlike the Opal, she is very public with her grief on the matter, having berated those who might have talked bad about the fallen.
Finally, there is your great-grandniece, the Sapphire Aspect. Sapphires are created when a Sovereign looks at their reflection in the Fount when they Exalt and marvels at their own beauty and strength. They tend to be self-absorbed artists and muses, though rarely are they useless in a fight. Your great-grandniece was born into wealth and fame and embraced it wholeheartedly. While she does tend to prioritize herself in affairs, she is quite good at creating a nice first impression and often practices Diplomacy in her day-to-day life. Sadly, her background growing up gave her little incentive to improve in more... "smarty" areas. Her Learning to be frank is abysmal. Honestly, if it weren't for the fact that you became something far greater than a Sovereign Exalt, you might have felt more insulted that your mother allowed this vapid girl the opportunity to enter the Fount while leaving you high and dry.
And that's everyone! I will be doing some private rolls for their actual stats when it comes time to select the Ministers, so if you're wondering why I'm not giving any stats right now, that's why.
EDIT (5/27/24): Did a roll to confirm if Emerald and Ruby are Sorcerers. Emerald is, Ruby is not.