The Hachi-P song Lynne contains many allusions to rebirth (ex., the cicada's cries, continuously circling around the same track). Listening to the music box version clarifies between each group of stanzas, there is a set of tones in the background that loops four times each time it changes. Why? Because Four Is Death.
Just an interesting tidbit, but in The Tailor Shop on Enbizaka, the tailor kills people with her scissors. This is similar to the Greek Fates, who would cut people's life thread with their scissors.
This song is part of series depicting the Seven Deadly Sins, with this one being Envy. The difference between envy and jealousy is that envy is wanting what you don't have (i.e. I'm envious of your cool skateboard), while jealousy is someone else getting something you feel you should get (i.e. I'm jealous of the attention my boyfriend goves other girls). Knowing that, you might think that the song better describes envy than jealousy. Until you learn that he wasn't her husband, thus making her envious of the women who had him, as oppossed to jealous for the attention he's giving them.
What does the "infinity" sign in Bad End Night means? Upon watching the sequels, and discovering that the story is presented as some sort of "Groundhog Day" Loop, the infinity symbol is to signify the endless loops that have continued indefinitely.
That weird squarish thing on IA's neckband? It's a natural, a lesser-known musical notation symbol that cancels out sharps and flats. Which is appropriate, because her voice provider is a woman with an unusually deep voice.
When you think about it, almost everyone in "The Music Wizard of Oz" (except Miku, who just wants to go home) wants something to help them escape negative reactions from their peers; Kaito the Scarecrow wants a brain because he's mocked for his perceived lack of intelligence, Luka the Tin Woman wants a heart because she those who see her dance claim "her dancing lacks heart" (despite the fact that she puts so much effort and passion into it) and dismiss her, Rin and Len the Vegetarian Scaredy-Cats want courage because they are teased by the other lions for not eating meat and Meiko the not-so-wicked Witch steals the Wizard's guitar because she is feared by all and wants somebody to be her friend.
Rin and Len's most common fanon portrayal, with Rin being more emotional and impulsive and Len being more rational and composed, makes sense when you think of their motif; Rin and Len are typically seen as two halves of a whole, with Rin being the right half and Len being the left. The right side of the brain is typically associated with emotion while the left side is associated with logic.
Kaito invokes one of these with his (well, Kettaro's) version of the song Hatsune Miku no Soushitsu. Initially, it sounds just like a strange techno-pop Kaito song with static in. But then you watch the video... wait. Why is Kaito suddenly screaming in agony in the middle of the verse? Why did the screen suddenly go grayscale, with bursts of static intruding on the image? How come the lyrics went out of sync with his mouth? Why are his movements getting weaker, like it's difficult to stand? Why is he collapsing to his knees, clutching his head, but still wearing that serene smile and singing the peppy techno song? Well, that's an easy one: his file is being corrupted, hard. In the middle of a song - and Kaito knows it. But he's a computer program designed to sing and dance, not show emotion. So despite the fact that he's managed to break through earlier, in order to scream, well... he's got a program to run. Face stuck in a static smile, being eaten apart by a virus, Kaito sings his song.
That version is even sadder when at least one translation has her begging to be saved. The poor girl is dying, she knows it, and all she can do is carry out her program and plead with her creator ("master") to help her.
More a case of Fridge Squick: Duke Venomania's Madness shows a list of women who have disappeared into Gackpo's mansion to join his harem. One name on the list is Josephine - which happens to be the name of Rin's horse in Daughter of Evil.
Well, mothy has confirmed that Venomania takes place centuries before Daughter of Evil, so it's most likely a Mythology Gag.
There is another name on the list - "Yukina Kaina". Sounds like Yuki Kaai who is only ten years old. That poor girl...
Have you noticed that her age is listed as a censored, single digit?
In "Gift from the Princess who brought sleep", we have Margarita, who snapped and continued to give her "gift" out to people after she most definitely knew what the real effect was. Newspapers were writing about the incidents. How many people might have found out she was behind it all? And how many people did she have to force-feed the "gift" to???
"Trick And Treat" is a song about luring children into the woods, capturing them, drugging them, and removing their hearts (and possibly other organs).
In a twist reminiscent of Banette from Pokemon, in the animated PV, Rin and Len are Miku's childhood dolls who have been reanimated by demonic rituals to seek revenge on the girl who abandoned them. Don't ever leave your dolls, kids; they'll kill ya!
In one PV for Hello, Planet, we are shown that the mailbox in Miku's shelter is sentient — at the beginning of the video, it makes a sad face and dips its head down. Miku and the mailbox are the only sentient/living things on the planet. At the end of the song, Miku dies and goes to heaven, meaning that poor mailbox will be alone forever.
In Hatsune Miku and Hatsune Mikuo's duet, Hikari (Light), the computer detects Mikuo as a bug, and he's subsequently destroyed. Fastforward a bit, and we come to The Disappearance of Hatsune Miku, where she's being eaten alive by a virus. Could quite possibly be leftover remnants of Mikuo's bug.
Thinking about Circus Monster I realized something. It tells about a monster that no one really sees but everyone loves hearing it singing and about it's suffering because it's apart from only person important to it. Now,thinking about the lyrics....they could be telling about the "life" of a Vocaloid. No one really sees them,only fanarts or fanmade videos about them or projections in shows. And the person that they really want to see could the composers of their songs.
In "Rotten Girl, Grotesque Romance", Miku is a Yandere who kills Luka and mails her head and torso to Kaito. We then see him sitting in his room with the corpse, petting its hair, while Miku sings about how she'll leave a gift wrapped box containing a kitten head outside his door every day. Then, we see Kaito, still sitting in the same spot with Luka, and there are several of these boxes in the background that weren't there before. Those kittens, not to mention Luka, would have been fairly decomposed by then...
Even worse when in there's a rumor that it's might have been based off of a real murder case of in Japan, which hasn't been released in Japan. The one piece of information I've got from the rumor is that one of the victims, a cat-lover, was sent kitten heads before he died.
A lot of songs involving Yanderes combine this with Paranoia Fuel when you realize that the victims barely even knew these people, or had only met them a few times ( as in "Rotten Girl, Grotesque Romance", "Love Disease", and "The Tailor Shop on Enbizaka Street"). It gets even creepier when you realize that your neighbor, or that pretty girl at the cafe, or any random acquaintance, could be stalking you right now and you would never know until it was too late.
If the vocaloids are Animated Actors, then, judging from the songs where they play themselves, they are probably True Companions. Now consider all the songs where they rape, murder, and otherwise horribly traumatize one another.
When you get past the fanservice, Spice! has some...rather unsettling implications that can turn Len into a borderline Villain Protagonist; he courts girls constantly, has sex with them, dumps them the minute he gets what he wants, and repeats the process as much as he pleases, all while expressing a cheerfully nihilistic attitude about the whole thing and not caring about any of the girls he hurts (to put it into perspective, Word of God says that RIP=RELEASE is the sequel to Spice!; the song is about Luka being driven insane, and wondering about killing him if he doesn't fall in love with her.
Speaking of "A Clingy Boy"... Toward the end of the song, there is a line saying that the boy thought he would see his beloved soon, but that she disappeared again. Combine that with his behaviour during years 1-6 - he keeps hurting himself in various ways, even saying that all his bones were broken, and doesn't care that his house is burning, only surviving through sheer luck. Was he repeatedly trying to commit suicide because he couldn't get over her death?
For those not familiar, this song is based off of the Japanese Freak Circuses from quite a long time ago. The song includes mentions of the children being raped and forced to eat human flesh. The PV explains things in more detail; these sideshow freaks are actually kids taken off the streets, dragged into the woods, and mutilated in ways including two twins being stitched together and kids having acid poured on their face. As in, sulfuric acid on their bare flesh. And while the song mentions a lot of these kids having suicidal thoughts, one of them is actually seen hanged in the PV.
"Party x Party" is a really upbeat song about Miku leading a bunch of adventurers to get some gold, and in the end it's revealed in the end that she's the Game Master, and they party even more. However, Miku is actually one of The Fair Folk, she led the adventurers to her castle to a party that never ends, turning them into dolls. It's no wonder if appear stories that nobody would ever heard about those adventurers after that.
Additionally, there's a doll of Miku herself there too. Unless Miku somehow managed to both stay normal and turn herself into a doll at the exact same time, it's safe to say that this isn't what happened.
In Twilight Night, the previous loop shown has Miku bursting in on a party and killing everyone except Gumi and Gakupo. However, Meiko and Luka are lying dead on the ground before she breaks in. What happened there?
In Portrait of the Pirate F, we see Rin as Tinkerbell take Len to Neverland and him acting out the role of Peter Pan... until he grows bored of the peace resulting in defeating Hook and he decides to take over the ship himself and be the pirate. We see pictures implying that Kaito as Hook arrived the same way Len did and we see a Miku who is obviously supposed to be Wendy at the end, so this begs the question, for just how long has Rin been doing this over and over again?
Also, notice how each new Captain Hook has a hook for a hand. After Len dons his Hook garb, he now has a hook in place of his left hand. Could this mean that to play the part, each new Captain had to chop his own hand off?
Miku's backstory itself states that she is an android from the future where all music has been lost. Now combine that with the fact that she exists in this reality.
This in turn leads to some interesting and heartwarming Fridge Brilliance—Miku was sent here from that future to prevent all music from being lost. And considering how famous she's become and how much music she has been making, it's working.
In Meltdown, why choose the method of jumping into a nuclear reactor? It's a little over the top, isn't it? Why don't you slit your throat or put a bullet through your brain? Also, nuclear reactors are highly guarded places. You would need frickin' security clearance to get into the nuclear power plant, let alone the reactor. Does the singer have security clearance? What is this even?
It might be symbolic. Might.
In *Hello, Planet., how does Miku's master have a coffin already built for himself if he's the last human on Earth, not to mention the fact his body is locked up tight in the coffin before Miku arrives? Did he just happen to find an empty coffin prior to his death, and laid down in it? Would that mean heknewhe was about to die?