1. Why was there not much KR(or Tokusatsu in general from what I hear) in the 90's? ZO seemed like it could have been an awesome series.
90s had Metal Hero and Super Sentai, a few one offs and also Ultraman, although not a big stream of tv shows, the weakest franchise there was Rider. Anyway, something happened between the transition of Black RX to the next Rider series and they just couldn't get things together to make a new tv show aftewards.
I never saw Rider's toy sales back then, but I wouldn't be surprised if they weren't that big.
2. How come KR the Next subplot had absolutely NOTHING to do with the main plot involving the actual Riders? I mean, the First atleast tied into it at the end.
It's connected to V3 and that one girl Hongo meets... Anyway, that movie was written by Inoue and in his later days he started writing subplots completely unconnected to the main plots of his tv shows and movies.
3. Where can I watch some showa riders with subs? Seems everyone on here has seen them but me.
Can't post links in this forum. The main groups that subbed Showa series are KITsubs (incomplete first Rider and Skyrider, progressing very quickly, with one episode per week at least, they also have a few Super-1 episodes, but that'll be on hold until they finish Skyrider), Midnight Crew Subs(incomplete Stronger, very slowly), HiNoTori (Amazon, complete), Century Kings (Almost or Complete Black, haven't checked them recently. They're very slow but have finished/are near finishing the series).
4. Was Riderman in All Riders vs. Dai-Shocker supposed to be separate from Joji Yuki? If so, who the hell is the guy in the final battle then?
Yes, Gackt is credited just Joji Yuki, rather than Joji Yuki/Riderman, so they're separate. Gackt was the Joji Yuki of Tsukasa's world, while the one in the final battle was presumably the original (Although Riderman's actor is dead, they used Riderman suit actors from Black RX and Skyrider for him during his appearances in Vs Dai-Shocker).