No idea if either will appear in the anime, but the game does have Ritsuko's cousin Ryo (who was pretending to be a female idol in the Dearly Stars game previously), and
Saki, who is, err, Saki.
Saki seems to be really popular over here. In second hand shops, merchandise related to them seems to be more expensive than other Side M characters. For example, in a Lashinbang I went to in Nakano Broadway, there were some acrylic stands of various Side M characters; all were 1000 yen, with the exception of Saki, who was 2000 yen.
The new merch is more affordable, but almost none of it features just Saki by themselves. It's mostly Saki with the other Cafe Parade members. There's a heart shaped badge, a large acrylic keychain, and a rubber keychain of just Saki, though the first two use an art style I'm not super fond of, and the last one is only in blind boxes. They're also selling a scrunchie themed after them, for some reason. Anyway, I wish it was easier to get good merch of them. Hopefully there will be more as the anime airs.
Moving away from merch for a second, I'll probably watch the anime once I know they're going to appear in it for sure. I just hope they handle their character well. From what I've read about them, Saki seems like a great example of a nonbinary character, and more representation is always something I appreciate.