Though, I wonder what sounds would result if one were to use the Deadman Vistamps in the Revice Driver.

I can't get over how genius it is to have Vice's "teeth" as a part of his primary design and all of his forms. It works so well because it's literally impossible for it to not aesthetically go with his form changes. A lot of Kamen Riders have teeth or mouths incorporated into their designs anyways, and almost all animals have teeth.

A look at Julio and Orteca

Oooh hang on a second.

There's multiple animals going on for sure in each design; but the first one prominently uses a squid as part of his aesthetic, while the second appears to use a wolf (in the middle)?

Much like Kamen Rider's Dr. Shinigami and Colonel Zol...

Yeah at first I was like : Octopus and Wolf/Dog but then noticed the kabuto head of the 2nd one.

The 2nd one being scary af by the way. the head/jaws that are his shoulders are wow, he has teeth/mouth everywhere on his body and the wolf mouth looks like holding intestines as if he is ripping your stomach (maybe it's a coyote or a dingo or something).

Anyway he really makes me feel uneasy.

Yeah, I think it's the body horror aspect of his mouths for eyes that freaks me out the most.

On a side note, I'm both amused and unnerved that Orteca's seemingly got mouths everywhere except for the one place a mouth should be located.

Err... My mistake, but Julio's the one with the mouth-galore. Orteca's the seafood lookin dude.

And there's a prominent white portion to the squid Kaijin...

I wonder if we'll see an Ambassador Hell/General Black reference.

The only one left not seen is Aguilera. Will she become a monster or a rider?

My current prediction for these three is that they ofc start out as the antagonists here, but as Fenix later reveals itself as the true big bad they'll either become out-and-out heroes or otherwise have a big alignment shift which is where they'll become Riders (or at least just Aguilera)