I can imagine that they will repeat the situation with Sophia from Saber, in the style of: "To save the world, we need the strength of all riders." Or even the situation with Hiromi from Revice: she wasn't supposed to be a rider, but the fans wanted to, so why not tweak the script a bit? But, given that at some point it will inevitably become clear that the organizers of the game are villains, Tsumuri may also turn out to be a kaijin.

I'm kind of curious about the Jamato. Seems like they're samurai mooks, but I wonder about the more major ones.

Which is kind of a nice change actually. So far except the Jamato, you don't know who is evil.
Like, when was the last time we didn't know big bad names or generals from the start ? Ghost ? (Jabel came quick but at the start it was just Saionji and Alain).
Bu it does feel more like a Gaim situation tbh.

Girori and Tsumuri are names that ring enemy-ish but that's as far as it goes.

I think this is the only example of a "big monster" on the trailer:https://i.ibb.co/jJjJ1J9/Geats.png
It's hard to say anything specific other than that he appears to be wearing rider-player underwear.

Based on the lines on the stomach...

http://pbs.twimg.com/media/FZouAGnWA...jpg&name=large

Seems like these grunt types might evolve into the stronger monster of the week forms. Which makes sense, Toei's embraced modular enemy designs in terms of creating new monsters.

It also highlights the franchise's typical similarities between riders and their enemies. Just as the riders in "Geats" become stronger by wearing different pieces of armor, so the monsters gain strength by putting on a new skin over their former essence.

I'm kind of curious how sentient they are. Especially because I assume they're "programmed" to service the Grand Prix.

Only thing missing in the villain side are generals. Who're the generals!? Hope there's a female one too!

I kinda hope there are no generals, actually. I feel like the show doesn't need them.

I don't think the concept of a chaotic battle royale where it's every man for himself is enough for 40+ episodes. I think the main villain and the generals will be in one form or another. Another thing is that they can be both kaijins and riders.