Before "Silver Cross" regained his memory and took the title "Kamen Rider ZX" he was friends with Tiger Bazooka, Darkness Ambassador's most trusted aide. Of course once he became Kamen Rider ZX, he and Tiger Bazooka were enemies. Tiger Bazooka's human form Mikage, Eisuke was played by Nakayashiki, Tetsuya the in suit actor/stuntman for all the previous Kamen Riders.
brother of Hell Ambassador
(Played by Ushio, Kenji)
Toei produced some good looking kaijin for Kamen Rider ZX, it's a shame the television series was never made.
Like the previous groups
the Badan Empire had its own soldiers
The Great Leader is only seen for less than 30 seconds at the end: