[Kurona]

It depends on the show.

In something like OOO or 555 or Drive, you've got Kamen Rider as 'the' hero set apart from all others. Even when secondaries join the fray it's in that same kind of, set aside occupied 'special' slot. Kamen Rider is still the hero.

But then in other series like Ex-Aid and Build and Zero-One, not only do you have a lot of Riders but pretty much the entire main cast are Riders. There, Kamen Riders tend to just be what the cast are; Build, Cross-Z, Grease and Rogue are just the squad. Saber, of course, is pretty similar.

So it does kind of stand out in those cases where you have the one, singular character of those casts and groups who isn't a rider. ... and who suspiciously tends to be the only woman.