>>100380258Rio has a collab at 15JST, but it might end before 19JST.
Izuru is always a good guess, plus it seems like the kind of game he'd like/collab he'd organize.
Not sure if Uyu said anything in his morning stream, but he did tweet that he'd be doing something in the evening.
Rikka, Temma and Shien are also possible, but wouldn't count on the others.
