tbh i feel the biggest problem with rider's depiction of female riders (besides the fact that the wide majority end up dead/incapacitated) is the fact that even up to this day, they end up revolving around a man AND almost always have an arc about like...becoming more traditionally submissive/girly, after being Epic Girlbosses in their introductions
this is even evident on their fashion. i often think about how their first outfits tend to be like, jeans, suits and leather jackets and by the end most of them are wearing skirts or "cuter" clothes. it's really like, interesting
i don't think sentai or ultra or MH or other tokus are Perfect on how they depict women, but i think rider is the worst bc of how insidious it gets with this. the others either have Good Girls or like, ignorant sexism, or the really bad examples are like from the 70s or bc hacks like sakamoto worked on them. rider is just very consistent on purpose about these tendencies, for over 50 years now lol