[Kiwami]

Okay, reading this topic, what even is a theme?

Cards aren't a theme, it's a gimmick. Ryuki, Blade & Decade don’t share a theme, they share a gimmick.

Insects aren't a theme either, only the Rider-suits are modeled after a grasshopper. You can't call this a theme like with Sentai, because in Sentai everything centers on a single element. For example, Ninjas: The suits look like Ninjas, they fight like Ninjas, and their gimmicks are Ninja-related.

Kamen Rider never really has an Insect theme outside of Kabuto maybe where the forms are named after beetles and they have the Zecters, but the Showa Riders are clearly not Insect-themed. They only wear a bug-man costume, that's it.

From my point of view most Kamen Rider shows after the Showa-era (maybe except Kuuga and Agito which are similar for obvious reasons) have a unique theme which only pays homage to the origins of Rider by having slightly bug-themed costumes. It’s not their theme though.

And no, I don’t want them to reuse themes because that’s something I hate about Sentai, you should be as original as possible in a franchise which has a new show every year. Maybe with a TV-special for a special occasion, but not for a full show.