Don't let the upbeat music and the colorful visuals fool you into thinking these games are entirely lighthearted, because Project Diva can and does have its fair share of scary moments.
Go to the Vocaloid page for tropes related to the songs specifically.
- The music video of Sadistic.Music Factory in F. The song itself could be pretty scary if one takes into account the lyrics (which are about being trapped in a factory and forced to make music for a mechanical tyrant for the rest of one's life) and the frightening robotic monotones, but combine all that with the Chance Time ending...
- The Disappearance of Hatsune Miku, which has the song become garbled, as well as there being interference and odd glitches in Miku's movements, constantly. According to Word of God, Miku is being deleted while attempting to complete the song. The end of the song is when she finally crashes due to it. By the end of the song, Miku has resorted to desperately banging her fists against the screen as if she's begging for her user to cancel the uninstallation. And at the end, she says a cheery goodbye before just...freezing up with a sad smile on her face as her voice speaks eerily in the background.
- Pinky Swear from F 2nd is a subtly off-kilter song with an equally off-kilter video. Its creepiness is mostly due to the weirdness of the visuals and implications of the lyrics until the end of the video implies that Miku has not only cut off her pinky finger as promised in the lyrics but has incorporated it into the bento she's shown making for her crush.
- The Mikudayo head/costume is either hilarious or this, depending on taste.
- The entire video for Kagerou Daze wherein Miku stumbles onto the site of an accident and repeatedly gets killed or injured trying to avoid the domino effect of everything that goes on, all because she tried to save a cat from getting hit by a truck. And when she finally manages to save the cat and survive long enough to make it to her concert, the cat knocks over a ladder, causing the set to collapse and crush her.
- The video of NegaPosi*Continues may definitely startle people the first time they see it as the game Miku is playing appears happy and normal at first, but when repeated continues occur, the game seems to be slowly corrupting, as the music slows and the colors become inverted, with Miku herself appearing to glitch, especially in a certain section that can come unexpected as static shows and Miku's head moves completely erratically.
- The MV for "Ashes to Ashes" is one of the eeriest in the series, with KAITO mournfully singing about the cost of immortality over a landscape that can best be described as a hellish, steampunk version of Dracula's castle. The second half, however, is when things really get creepy: KAITO enters a room with a sinister-looking display featuring balljointed puppets of the other Cryptons and begins to dance with them. Then we cut back to the throne room and see KAITO going into cardiac arrest, falling out of his throne and writhing on the ground while the dance seemingly echoes in his head before his heart finally gives out and he slumps to the ground. It's even creepier in Future Tone, thanks to the graphical upgrade.
- "LOL-Lots of Laugh" in Mirai DX features a figure in a giant rabbit costume. The way it just suddenly appears in a deep close-up and just stares at the player for several seconds is just jarring. Arcade's version of the PV adds a comical "boing" effect to the bunny's reveal, but somehow makes it look creepier than in mirai DX.
- Also in Mirai DX, the PV
for "Matryoshka" features some creepy parts such as X-ray photos showing blood spreading through a person's lungs and wrists, a moment where a butterfly's wing is being cut off with a pair of scissors, and black-and-white pictures of the Nendoroid characters, each sporting a Slasher Smile, splattered with paint that makes it look like they are covered in blood.
