
I honestly wouldn't mind if just Ray and Winston showed up. Those two are the most ok with returning and they are the two characters that would seem more willing to continue the Busters franchise in a mentor role. I liked the dynamic between the two of them as well in the previous movies
Yeah, if Murray doesn't want any part of it, then there's no need to bring him back. But I'd love to see Akroyd, Hudson, Annie Potts and Sigourney back if they want to be. And Rick Moranis of course. Is he acting again?
Moranis retired from acting after the death of his wife to focus on raising his kids. After he did that bit on the Goldbergs he announced he was ready to return and is just "waiting for the right roles". If they offer him a real part in this, not a random cameo like the '16 movie, I think he'd take it.Moranis has more or less retired from acting. Outside the bit he did for The Goldbergs last year he hasn't been in or voiced anything in over a decade. I think if anything could get him back at all though it might be reuniting with the original Ghostbusters cast.
But hey, Blues Brothers 2000 worked out, so this should as well.

"I took a break, which turned into a longer break," he says. "But I'm interested in anything that I would find interesting. I still get the occasional query about a film or television role" — he's repped by the Santa Monica-based endorsement firm Bailey Brand Management — "and as soon as one comes along that piques my interest, I'll probably do it. [But Ghostbusters] didn't appeal to me."
What is it, like a riff on Spaceballs & Little Shop Of Horrors?
This was when the reboot was coming out and why he didn’t cameo.
Rick Moranis Reveals Why He Turned Down 'Ghostbusters' Reboot: "It Makes No Sense to Me"
12-year-old actress Sarah Abbott, who appeared in episodes of Heroes Reborn and Black Mirror, is reportedly among the young tryouts auditioning for Jason Reitman’s Ghostbusters 3, according to HN Entertainment.
According to character descriptions shared by HN Entertainment, one of the roles is a 13-year-old boy described as “a conspiracy theorist” deeply into fantasy, and another is a 12-year-old girl described as a “science kid” who has difficulties connecting emotionally, unaware she makes comments others find offensive.
Descriptions for the remaining two leads have yet to surface.