I still get chills thinking about just how calm Build Hazard was when Sento lost control. No shouting, no flailing, just dead quiet and brutally efficient violence.

I'm not sure if this is scary scary but Emu seemingly killing Parad was incredibly intense. Like you feel deeply for Parad, despite how bad he was up to that point, he is facing death. Emu is potrayed in this cold ruthless fashion, which is such a contrast to his normal character. Then you have Parad falling into the water as a metaphor for death and it's so good!

I feel this is something that gets overlooked. For all the other Riders, their "Berserk" mode not only leaves them mindless, but it's also an actual form that they have to change into.
Red Shoes System is a part of every ZECT Rider, and they're just no longer in control despite being fully aware. So Kabuto being unable to stop himself from hurting Hiyori becomes all the worse.

The brutality in Kamen Rider Amazons from the limb and flesh-tearing fight scenes to watching people get eaten raw.

Pretty much any scene where the Gurongi play their game. They may not be the best designed villains, but they’re IMO the most ruthless and terrifying. No wonder there’s a warning to watch the show in a well lit room

Man, I actually looked that scene up after you mentioned it (since I have yet to see Ryuki, waitin' on the Tokushoutsu release now) but...yeesh, I see what you meant.

Gotta love the juxtaposition of Kamen Rider's really dark moments and the fact that it's a kid's show, with a few exceptions in terms of specific seasons or projects.

It was either that or the fight scenes of Kamen Rider Shin. At the least the Shin Kamen Rider: Prologue was geared towards adults. Ryuki was a Sunday morning power hour deal which makes it even scarier. The average Taro Tanaka's kaninabe would not be the same ever again after that. :lolol

I may not have been fond of it from a storytelling perspective, but just about everything about how Ark-One was filmed and framed and touched-up. So many shots with a head tilt and that one red eye highlighted. It really was something else

Yeah, I admit I did find it scary when I first watched it a very long time ago but then in Britain we have had the odd thing like Ant McPartlin's paintballing accident on Byker Grove and I'm guessing most countries have had the odd scary moment in kids TV so it's not like no-one else has done stuff like that imo!

Maybe it's just cause I was a lot younger when I watched it, but Wizard getting his Phantom destroyed from the inside in the Infinity arc was pretty strong implied body horror. Haruto's screams... yeesh.