Moscoy
Maybe Sister is a servant of Nox if Nox is the real villain, Nox is the leader of a Church cult or not? So maybe Sister was always her servant and so maybe Clown too?
Oh I never thought about the Church and Sister connection

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Okay I found many clues about the true enemy
I don’t know if its Mosco and Sister or if they’re just servants of the true enemy but let’s see
Ziggy said that the chronophages are connected to Mother and Machines. They already played a huge role in Ziggy's backstory and are drawn by Rebecca’s ether
The true enemy tries to use this power and needs Etherion for it = Rebecca's dead body.
We also know that Clown knows the truth behind Etherion and the true goal of "evil Ziggy" who got took over by the true enemy. This means that Clown is directly working for the true enemy.
They also left Nox alive… who has probably a similar power to Rebecca.
Now it can’t be Acnoella or Nox because of Hermit's reaction.
She wouldn’t be sooo surprised about the fact that a villain like Acnoella or someone new like Nox are their true enemies. It must be someone she didn’t expect… an ally
Okay so far we know that Clown is working for the true enemy and that it must be someone unexpected.
Ziggy and the Shining Stars lost their memories and who has the ability to erase memories?
Sister!!
She probably erased her own memories too in order to be the perfect spy or she’s a great actor.
We didn’t see Clowns and Sisters flashback because they both served the true enemy.
Sister has also a "crush" on Rebecca who resembles Nox lmao
This cover page could also be hint
but what about Mosco?
Ziggy goal was Universe 0… and look at Mosco's full name
"Mosco -
Versa 0"

