I’m sure it’s been done before, but I just can’t be bothered tonight.
I’ll take the low-hanging fruit
Marilyn Manson :: Dr. Frankenfurter
Macaulay Culkin :: Riff Raff
Bonus game: Recast, reversing the role types of the squares & wild things
Christopher Walken:: The Criminologist
Genius.
I’m not a big Rocky Horror fan, but I think Eddie Izzard should be considered for a part somewhere.
Katherine McNamara :: Columbia. 5’5" (per IMDb), can sing & tap, and is about as old as Little Nell was in '75.
Basil Masters :: Rocky with a tae kwon do upgrade.
Jim Parsons: Brad
Any of the Franco brothers :: Eddie
But that will make it weird when we cast Chris Hemsworth as Rocky.
He’d be good. But give the role to Richard O’Brien so there’s a connection with the original.
(That said, it was a sad mistake to cast Tim Curry in the remake.)
I would pay good money for that.
That would make it perfect.
I nominate William Shatner to play the Criminologist.
And therefore Christopher Walken as Dr Everett V. Scott.
Mackenzie Crook as Riff Raff.
Christina Hendricks : Magenta
Bill Skarsgard as Riff Raff. Or he can just be my date when I go see it.
Oh. My. 
Totally agree.
Amy Adams as Janet, Peter Capaldi as Dr. Scott.