Well, it's not the Narutaki actor as Jigoku Taishi in the movie, according to a couple of Japanese sites, but veteran actor Ren Osugi.
While Renji Ishibashi and Ren Osugi are two cool performers, who have played countless screen villains, I still think it's a bit of a slap in the face when Hideyo Amamoto and Kenji Ushio are iconic figures in the history of tokusatsu villains, particularly those two characters of theirs. I guess it's good that maybe Ishibashi's not going completely to waste as Natsumi's idiot grandfather. :shrug:
Kouhei has confirmed that he's returning for 20-21... that matches up pretty well with Dark Kiva, I'd say. I'll be surprised if he isn't back as Otoya.
I still think it's a bit of a slap in the face when Hideyo Amamoto and Kenji Ushio are iconic figures in the history of tokusatsu villains, particularly those two characters of theirs.
But really, who would be able to fill their shoes. I wouldn't want to see them CGI-ed in like THE FIRST and well atleast they didn't get Gackt or anything... that would be a big slap in the face.