I don't think a female rider will work unless its a third since Rinne fell off hard as a secondry

Considering how much Gavv has in common with Gotchard in terms of concept, I'm more inclined to think that they will try female secondary again.

What does it have in common?

The name starts with a G?

cause there is nothing else that is common with it
in

and we wont know anything till a writer is announce

if anything with the weird idea of a talking belt and the whole gummy monsters

it has more in common with Drive and Gaim

Given how the chocolate form seems to be wearing a poncho and the shape of the helmet, I think is meant to evoke a cowboy hat, not a top hat. Furthermore, the marshmallow form's design resembles muscles, and unless I'm getting confused by the perspective it even looks like it has a topknot hairstyle, likely based on a sumo wrestler or other martial artist. The chips and lollipop forms are less clear, although the chips form's curving armor and slitted eyes somewhat resemble knight armor, and the lollipop form looks bulkier than the others so it might be a mecha?

This is all still just guessing, but I think Gavv might echo what Gaim did, with the transformation items being themed on food but the actual forms also using the aesthetics of various warriors. Although if that's the case, I have no idea what the base gummy form is supposed to be, unless they're counting "Kamen Rider" as a type of warrior XD

Gammies are clearly alive, just like Chemies. Also, we are immediately shown several forms and there is no information (except for the already unfounded one about the chocolate secondary) about other riders. So it`s definitely not like Gaim. Drive, yes, but it is more similar than Gotchard solely due to the presence of a live belt.

Well Gavv's based form is sort of kangaroo like, so maybe its like a martial artists

As Gavv's has a punch gummy and a kick gummy to use his full power punch and kick moves

Also the kr reddit gives a better look at the forms

Sumo might be right, the chip one looks more akin to a ninja

Red one is indeed a cowboy as you can see the clear pancho on it

The lollipop is some kind of mech like form looking at it, it seems to be something like a car as the chest plate sticks out like a car front and has the same overall shape

So I think your right its more types of warriors

I mean there is other seasons that has living things

Kiva's final form was alive

The kabuto tickets were living things

Drives also had some form of int

Ghost eyecons also were alive to a degree

So no its not gotacard like just cause of the chemmies and now gummies

OH also in blade the undead cards were still alive

and as pointed out by the other dude

The rider forms are more akin to Gaims being based on types of warriors

I think you're right, but here the different types of warriors are not different riders, but different forms of Gavva. And the basic one is the basic one, on top of which the rest are dressed.
The chips are more like a samurai, given the characteristic ties of the armor. And the marshmallow one is definitely a sumo wrestler.
And if lollipops are mecha, then another similarity with Gotchard is emerging.

Dude Gaim did the mecha form first

You are making it sound like Gotchard was the first to do all of these things when infact it wasn't