I think they just mean in the sense of the vampire aesthetic being re-used the same way the Amazon aesthetic was re-used.

Which brings me to my question - I've heard Kiva is horror-influenced (makes sense, since vampires). Are there any other Rider series that have that sort of theme?

Well... not really as a theme, but Kamen Rider Black for example is very much like a horror movie early on. And it does tackle some classic horror setups, like a train vanishing in a tunnel, a small village being controlled by a demon, a kid who's school class is turned evil but no one but him notices and so on and so forth. Later in the series when it starts being the "Japanese Children Adventure Show featuring Kamen Rider Black" they tone it down a lot but in the first dozen of episodes? Shit's real.

And then there's Kamen Rider Shin which is basically "What if Kamen Rider was a horror movie?". It's rather bizarre.

I got a similar vibe from some of the earlier episodes of the first Kamen Rider series and I dug it. Maybe i'll have to check out black soon.

I'm not sure how I feel about Shin, since I really don't like the suit. I do, however, like J horror. Is it at least good?

I've heard similar things about The First and The Next as well

Yeah Black is kinda like that, you can compare it to the episode with the Bat mutant where Hongo investigates and stuff and the Bat does rather scary stuff to people, Black reminded me a lot of episodes like these. I haven’t watched much Showa but neither V3 nor Amazon was like that early on so I guess it’s not that common.

Shin… it’s different to explain. It’s kinda like the Fly in a sense, but then there’s the Killer Cyborg and stuff… it’s weird. I wouldn’t call it a good movie, but it’s interesting to see because of what it is. I think it’s better than The First & The Next, but I still don’t feel like I ever want to rewatch it.

Kiva was based on vampires, while Ghost was based on well... "ghosts/spirits". If they do another horror theme for the next rider series, will they bring back the vampire-werewolf-monster concept to make up for Kiva?

Those were definitely my favorite episodes of the first Rider so Black definitely sounds good too. I've also heard a lot about how awesome Shadow Moon is, so there's that too.

So it's kind of body horror mixed with Kamen Rider? I can get behind that

I'd totally be down, since I love horror-esque themes and am loving Ghost, but I really doubt they'd do two similar themes in a row.

Yeah Shadow Moon's great. Easily one of my favorite antagonists in all of Kamen Rider. The build-up to his awakening is a bit of a drag but it’s worth it. Not only does he make for a much better Golgom leader than the High Priests but the scenes where he meets Kotaro and/or the supporting cast are all really good.

There's a negative thing to his awakening that I won't spoil, an element I really like leaves the show but Shadow Moon makes up for it.

Yup, the "Henshin"-scene is especially gruesome. For that one alone you should probably check it out someday.

Kamen Rider Shin could have been awesome if it was not so boring to watch. I try to watch it a few years ago and it was hard to stay awake. The only good things about it is the special effects. It was like Kamen Rider meets Baoh, but I feel like it was wasted potential. With a stronger plot and more action scenes, it could have been awesome.

Unfortunately, Shin Kamen Rider just couldn't find a good balance. The themes it aimed for worked, but they were poorly executed, while the fight scenes are just a drag to watch, since they wanted to keep a battle between an ice man and a bug man grounded in reality for whatever reason, so it was just a basic punch out.

Shin's desire to be Kamen Rider for a more adult crowd could have worked if someone on production raised their hand and said "Any adult that wants to watch a Kamen Rider movie is doing so because they want to see a Kamen Rider. Not a love drama with 20 minutes of The Fly woven in."

The Baron Fang episodes of V3 have a lot of horror elements to them.