- Nathan threatening to kill Amshel if he harms Diva. It's only for a split second, but his voice sounds outright demonic, and it's so unlike what the viewer's seen of him so far that it's downright creepy (he even cracks a wine glass Amshel's holding with pure Killing Intent).
- The Chiropterans themselves. Their hideous appearance aside, these monsters are actually people who have undergone a Painful Transformation. What's worse, many of them still have some of their consciousness remaining inside their newly twisted forms. Yuck.
- Chevaliers and Chiropteran Queens can mimic the forms of the people they drain. Just let that sink in.
- Saya going berserk during The Vietnam War, which we originally see as the very first scene of the series. Having detected Diva, a desperate Red Shield forced her to wake up by giving her an injection of Hagi's blood. The result? Oh, nothing except her slicing and dicing everything she sees indiscriminately. That's right, she was not only smoking Chiropterans, she was also killing American soldiers, villagers, and children. What's worse, this version of Saya is pissed, speaking nothing but indiscernible growls as she angrily tries to approach Diva.
- Those Chiropteran children in Episodes 12 and 13. As if their choir singing isn't disturbing enough, the viewers have the privilege of watching them burst out of the kids' bodies to reveal fetus-like monsters and brutally tear apart the mercenaries working for Red Shield. Fun.
- The Reveal of Diva in Episode 24. This is when the viewer really gets to see how fucking psycho and sadistic this Big Bad is. Hell, even Saya is freaked out from her sister's... quirks.
- Doubles as a massive Tear Jerker: Irene's crystallization and death. Knowing she doesn't have long without help from Saya, Kai convinces his sister to give Irene some of her blood. It at first seems to work... only for Irene to completely turn into crystal and stone, before shattering to death. That particular scene is the image for the Anime Nightmare Fuel page for good reason.
- How The Schiffs came to be in the first place. They're genetically-engineered Chevaliers, put under dehumanizing experiments and barred from learning even the most basic social skills as they rested in their cages. After finally breaking out of the hellhole, they realize that unlike other Chevaliers, their lives are finite and are seen as nothing more than weapons.
- To say nothing of Diva raping and petrifying Riku to death. No wonder Saya crossed the Despair Event Horizon after this horrific and despicable act.
- The Corpse Corps. To put it bluntly, they're the Schiffs' Psycho Rangers. And all the while, governments are convinced that they are Chiropteran-hunting robots, blissfully unaware that they too have presumably having gone under a similar brutal development program but are this time cold, thoughtless killers. It's hardly a surprise that Moses had a brief Heroic B.S.O.D. after finding out.
- Imagine being a young adult who's dragged into a room by two of Diva's Chevaliers. There, you are told that you will be pressed into service and the next thing you know, Diva approaches you and closes in on your neck, dooming you into an eternal contract to be her chevalier. And with no friends, you are stuck in this hell all by yourself. This is how Karl became a Chevalier.
- Diva's song is simultaneously beautiful and heartbreaking. It is also absolutely terrifying, not only because it signals that she is close by, but also because of its supernatural effects on people who consumed on Cinq Fleches products (as seen through her performances at the airbase and at the Met). That's right, if you ate or drank something made by Cinq Fleches, her song will indoctrinate you into becoming a Chiropteran!
- The flashback in episode 22 shows us how Hagi became a Chevalier; he fell off a cliff while trying to fetch a flower Saya wanted and Saya - misinterpreting what she'd heard Joel I saying about her needing blood to live - thought she could heal him if she gave him some of her blood. She was technically right...except that, when Hagi swallows it, he starts screaming and writhing in pain as his heart beat slows and finally stops, and he's left a wide eyed corpse in a pool of his own blood. He gets better, but still...
Nightmare Fuel / Blood+
Given that this series belongs in the same franchise that brought us the original movie and Blood-C, it was inevitable that there would be many creepy moments in this installment. It ain't the page image for Anime Nightmare Fuel for nothing!