Before the timeskip, the combined bounties of all Eleven Supernovas equal to Beli 2,152,000,000, the highest combined amount of any known group. It is currently unknown what it is post-timeskip. With the information revealed so far, the collective amount is at Beli 4,430,000,000.
Of the Eleven Supernovas, all but two (Roronoa Zoro and Killer) are Devil Fruit users as well as captains of their respective crews. Zoro and Killer are also the only members in the group who are not captains.
There are four members who can use Busoshoku Haki: Monkey D. Luffy, Trafalgar D. Water Law, Roronoa Zoro, and X-Drake.
Monkey D. Luffy is the only known pirate among the Supernovas that is able to use all three types of Haki.
2 Supernovas are confirmed D carriers: Monkey D. Luffy, Marshall D. Teach, and Trafalgar D. Water Law.
Capone Bege is the only known pirate among the Supernovas to be a parent.
Aside from Killer and Luffy, all the others were named after real life pirates or privateers. While Oda did not intend it at the time, Luffy has a similar naval term via a “Luff”. This leaves Killer as the only one whose name has no link at all to any sea-based term or name, and Oda admitted in an SBS he was given his name out of pure laziness.
Oda drew of ten of the Supernovas (leaving out Zoro) after the two-year timeskip.
In 72 Volume SBS, Oda drew the Eleven Supernovas (except Monkey D. Luffy and Roronoa Zoro) as opposite gender.
In the SBS of Volume 64, Oda drew the Eleven Supernovas (except Monkey D. Luffy and Roronoa Zoro) as children.