[henshinzero]

I've been trying to come up with good fusions myself. Depends on the "best matches" of the riders. As I'm motivated to make it Reiwa's anniversary theme.

Ichigo, Kuuga & Zero-One in the rider's main fusion form is easy.

Kabuto, Drive & Faiz are speed-based as Faiz upgraded in Reiwa

Agito, Wizard & Saber are dragon themed

Ryuki, Gaim & Geats are all game & desire-based

Den-O, OOO & Revice involve partnerships

I can't find which are good for Gotchard & Gavv!

I'd go with Double, Build & Gotchard.... but Gotchard & Fourze seem similar as Fourze wants to befriend everyone and Gotchard wants to befriend Chemies & bring them together with humanity.

Kiva & Gavv could work due to biting. Wish I went with Amazon. But then there's Drive & Ghost. Gavv & Kiva have the biting and yet Ghost has the eye. Even Drive has a belt with an AI.