This is a theory I've had for a while, figure I may as well post it here. I've already posted it on Tumblr a few months back(https://www.tumblr.com/tankgamingidk/775595443630587904/homestuck-beyond-canon-100-player-theory-so?source=share), and most of this post will just be restating stuff from that post.
So, we know there's going to be 3 nymphs and 3 satyrs. According to Hussie (in a non-canon post), the troll universe was made via a 48 squiddle session, and according to loop theory, the nymphs are going to become the squiddles/horrorterrors.
Now, if there were ever going to be 48 squiddles/horrorterrors/nymphs, in a session alongside satyrs, it'd be pretty odd for there to be only 3 satyrs alongside 48 of the other species. As such, it'd make sense for there to be 48 satyrs as well.
And hey, if you combine that with the number of candy kid players coming in, you get a grand total of 100 players. The perfect number for a battle royale. Now, we know that there is some kind of war between the 2 species. What if this war was to happen/continue inside of Shurb? It would also allow for the 48 squiddles specifically to create the universe, despite sharing the session with another species. Additionally, with the most recent upd8, we now know that there are a bunch of other players connected to our main 6 through Cha.OS that could make up those other 92 players.
One additional detail, if you add either A. The number of human players from previous sessions, or B. Vriska's number, to the number of players in this session, you would get...
108. Homestuck's new arc number.
That's it that's the theory. There's gonna be 48 nymphs, 48 satyrs, and 4 candy kids, all participating in a big war/battle royale inside of Shurb.
