Alice Allusion: Alice Human Sacrifice by Miku, Kaito, Meiko and Kagamine, Alice in Dreamland by Kaito, Persona Alice by Miku, Boku to Alice no Wonderland by Len, Alice by Hatsune Miku. A lot of songs have Alice in Wonderland theming.
ALiCE iN BLACK MARKET by Miku's DARK Append, if only for the title.
All There in the Manual: Anything related to the Story of Evil series, going as far as the characters' names, as well some very important facts about characterization and plot, especially including how the twins got separated in the first place and the fact that Rin's character does not remember that Len's character is her brother. Information has been released on Akuno-P's blog along with really really fast flashes of text on the velvet mix versions - and a novel series.
mothy has many listed on his page. For a narrow example, Story of Evil has "if we could be reborn...", "I will always protect you, so please always be smiling", and "little glass bottle".
Synchronicity has "keep singing"/"please sing" and "paradise".
The Lost Libretto series (Bad End Night, Crazy Night, Twilight Night) has "mitsuketa" ("I found it"). This one is particularly noteworthy because it's always said at the same point in each song by the same character (in all three songs Miku says it during the climax).
Big Bad: Many songs will have a villain of some kind, for example:
"Alice of Human Sacrifice" has the Little Dream; it lures people into its world and either gets them trapped (Meiko), kills them (Kaito), drives them insane (Miku), or some combination thereof (Rin and Len) all because it's afraid of what will happen to it if people forget about it.
"The Lost Libretto" series has the mysterious cloaked figure at the end. Maybe. It's still unclear.
The "Story of Evil" has Riliane (Rin), which is later subverted when it's revealed that the real villain was Prim Marlon (Prima).
The "Synchronicity" series has Luka's character, also a Well-Intentioned Extremist. She's the one continuing the human sacrifices and doing so because she thinks it's the only way to appease the Dragon.
"Dark Woods Circus" has the "Chairman", who's in charge of the titular circus.
"Wide Knowledge of the Late Madness" has the runner of the asylum, who is experimenting on the inmates for fun.
The Scientists in "Kagome Kagome", who are cutting up children to learn the secret of immortality.
Hello, Planet, though it's more of a "sweet ending with a little bit of bitterness". Bitter part: Miku dies in front of her master 's grave, not only from damage to her body (from the rain), but sadness, as well. Sweet part: Miku's tears cause the plant to sprout, she reunites with her master in the afterlife, and it's implied that her little plant actually reseeds the whole planet.
The game based on the song actually has two endings: in the alternate ending Miku's singing revives her dead master, and after a tearful reunion the two work together to revive the world with their potted plants.
The demo song of V3's Akikoloid has a serious case of this. A-ki-ko-ro-i-do-a-ki-ko-ro-i-do, Akiko desu. Roido desu. Akiko desu. Roido desu. Akiko desu. Roido desu.
Burn the Witch!: Luka in the aptly named "Witch Hunt" narrowly avoids this fate.
But Not Too Black: Subverted with Lola: considering that the English Vocaloids' character models are subject to the viewer, her skin color varies from black to white (it's usually one or the other). Played straight with Sweet Ann.
Butt Monkey: Leon. His most common incarnations are an extremely hairy man and a Nightmare Fuel render of a man that commonly appears in the magazine Leon. Most of his videos are parodies.
Kaito can also be seen as this. Half his songs are just parodies of others (though his originals are quite good), and in things like Chibi Miku-san is made fun of all the time.
Conlang - Kaito's breakthrough song Pane dhiria is written in Japanese and an Arabic-sounding language called Hanamogera, a completely made-up language by the creator.
Luka's re_Cycle has Arc Words sung in a made-up language, but unlike Pane dhiria, it does not appear to have a name.
SeikoP always uses a made up language for her Luka songs.
Kaoling is one of the most famouse composers to use their own language.
The Cover Changes The Gender: This is averted with surprising frequency — several male Vocaloids have covered Love is War and Romeo + Cinderella, for example, with the very feminine lyrics left untouched. Covers that do bother to change the gender usually dramatically alter the lyrics, often for a Perspective Flip from the point of view of the implied male love interest. This is also the typical practice in fanmade covers.
Covert Pervert: Some fans seem to have a lot of fun portraying Gakupo as such. Kaito as well (Lord Of Darkness, a parody of Daughter Of Evil, is a good example of this). Also Luka, who is a bi/lesbian pervert in Japanese Ninja No.1 (although she may just have been hired by Kaito).
Cute Clumsy Girl: Kisaragi Momo of Kisaragi Attentionis this in spades. She trips over a cat, runs into a pole, and hits herself with soda can within a few seconds of video time. From the same series, Mary, the main character of Imagination Foresttrips over her book in the latter video and spills drinks over Momo in the former, showing shades of this trope as well.
Department of Redundancy Department: In Miku's 39's Giving Day concert, she and the other singers (most notably Megurine Luka) are sometimes singing into handheld mics while clearly wearing headset mics.
"Yes, by every means possible, we go for the victory."
Downer Ending: Any horror or tear jerker song that doesn't have a Bittersweet Ending usually gets this. For example, Alice of Human Sacrifice ends with Meiko being imprisoned forever, Kaito dying/killing himself, Miku going insane and the twins wandering Wonderland aimlessly for the rest of their lives with no hope of escaping. Oh, and the Little Dream is still plotting to lure people into its world and drive them mad/kill them, meaning that anyone (including YOU) could be its next victim.
Note that in Saigo no Revolver, the bullet hole of the second gunshot landed neatly over Gumi's name in the credits. That same bullet is shot right when another bullet that was already shot when Gumi shot her lover was over the ??? name. ??? was the one who Gumi killed.
Supplementary materials confirm that this is what happened, though a later song reveals that Gumi did, in fact, survive.
The PV for Alice Human Sacrifice suggests that the Second Alice (Kaito) shot himself.
A popular intepretation of Rolling Girl is that it's about a girl struggling with wanting to commit suicide.
Drowning My Sorrows: Haku does this because she believes she can never become as good a singer as Miku.
Eldritch Abomination: The Chairman from "Dark Woods Circus" and the Little Dream from "Alice of Human Sacrifice" both give off these vibes. Depending on the PV, the latter will often be depicted as a Humanoid Abomination too.
Fan of Underdog: Any person who likes any of the UK-loids or Voyakiloids tend to be one of these, some out of pure spite for people who dislike them.
Fan Vids: Any sufficiently popular song will inevitably receive at least one of these.
Fantastic Racism: A surprisingly common topic. The Evil series includes racism based on hair colour, with Haku being shunned for her naturally white hair and all green-haired people being murdered by the princess. The ogre in Ogre and Maiden is threatened with a Torches and Pitchforks mob just for hanging around near the village, and is only able to befriend a blind woman who doesn't know that he's an ogre. (The same "oni" metaphor crops up in The Person who Loves a Demon.)
Witch, by Luka, focuses on her persecution because she's a witch.
Miku (Mikuo), Kaito (Kaiko), Meiko (Meito), Gakupo (Gakuko), Luka (Luki/Luke), Gumi (Gumiya/Gumo), Sonika (Akinos/Kaniso), Sweet Ann (Spicy Andy/Sweet Ani), Len (Lenka/Lenko and Rui), Rin (Rinto/Rinta and Rei), Kiyoteru (Kiyomi), Yuki (Yuuki/Yukito), Miki (Mikio), Lily (Li/Lio), Leon (Leona), Lola (Loyal/Lan Allison), Miriam (Wiriam), Prima (Primo/Primano) and Big Al (Little Ally/Big Alice).
"Gugurekasu" also has the final lyric, which most people can't even understand because of its obscurity: "Please search it with this Google."
Gakupo and Gumi's same-tune (different key) cover, "Aniimo." While "Please understand my feelings" and "I worry about you, always" at the beginning are grammatically correct (albeit strangely inflected, like "Gugurekasu"), the final "You are only one for me" would be perfect, if not for the missing "the."
It is excusable, however, by the fact that English sounds that do not exist in the Japanese language nor are inflected in the English way are nigh impossible for a Vocaloid to use, Depending on the Writer. This is possibly one of the reasons for Crypton's decision to produce more English-native Vocaloids, starting with a new bank of English phonics for Miku.
Hair Color Dissonance: Miku's hair. Officially its teal, but numerous fan arts, P Vs, and songs depict it ranging from a bright turquoise to green, and in some of Toyota's commercials where she appeared, it has a shade of blue.
Hanging Judge: Kaito as Gallerian Marlon is one of these in "Judgement of Corruption".
Iconic Outfit: Len's dress from Imitation Black. Although just about any clothing of the Vocaloids in any popular song, really.
Idiosyncratic Episode Naming: samfree's "Night Fever" series, which will always have the Vocaloid's name (or some variant of it) repeated twice in the name of the song (and it will always have two syllables), followed by a star and some variation of "fever", "night", or "burning/fire".
If You Kill Him, You Will Be Just Like Him: Meiko realises in the Evil fan-song Daughter of Revenge that if she kills Len, she will be taking away the only one who loves Rin, doing effectively the same thing Rin did to her. She kills him anyway, deciding that she's able to live with the burden of being evil if that's what it takes to get her revenge.
I'm a Humanitarian: Meiko in Conchita, the Epicurian Daughter of Evil. And in some versions of Trick and Treat, Rin and Len.
Utopia and A Ray of Hope. Humans transferred into Androids may have souls, but not morals (or Logic. Because natural humans tend to wage war, the United Nations decided to transfer all humans into androids. Those refused to do so are eliminated to preserve peace. Killing for peace's sake). Eventually deteriorating into eliminate all humans.
Improbable Age: According to this site, the main character in Judgement of Corruption is a talented judge, despite his young age.
The unfortunate reality is that a man Vocaloid is always a big risk. Kaito flat-out bombed in his initial release, Kiyoteru is easily the least popular of all of AH's products, Tonio barely gets the time of day, and Big Al (by far the best-received of the English Vocaloids) has gotten at best mixed reviews. On top of that, any man who wants to break into the market now will have to compete against Kaito, Gakupo, Kiyoteru, Big Al, and VY2. A few new male ones are in the works, but more and more of the new characters (especially the Japanese ones) have been female.
The sole exception to this is Len Kagamine, but this is justified by being partnered with Rin Kagamine in the same product. To make it stranger, Len's voice bank comes from the same voice actress that Rin's voice bank originates (Asami Shimoda).
Insane Troll Logic: With extra information from the songwriter, it is revealed that Meiko in Alice Human Sacrifice was trying to kill everything because she believed it would bring her out of Wonderland.
Meiko even in her past life as the girl's teacher, at first is in love with her best friend in The Thought To Tell. She then attends her best friend's wedding...
''Love is War'' is a subversion. As the title suggests, the singer is willing to do most anything to prevent her beloved from being happy with anyone else.
The ogre in ''Ogre and Maiden'' eventually cuts off ties with the blind woman and stops coming to visit her, afraid that her neighbours will blame her for bringing him to the village. He does it to keep her from being hurt, but she remains rooted to the spot, waiting for him to return to her, until the day she dies, so it's hard to say that it made her happy as such. The ogre does come back to the maiden much later, disguised as a storyteller, in which case she probably was very happy.
Japanese Delinquents: The eponymous character of Rolling Girl. Then she falls in love and gets sort of better. The PV for Project DIVA extend however, turns her disaffection with society into full-blown reality break-down.
Lighter and Softer: One artist on Nico Nico is known for drawing cute, cheerful PVs for depressing or creepy songs, reinterpreting the stories to make them seem more positive. So far s/he has done this to the Evil series (it turns out the whole thing was a charade to teach the selfish princess a lesson), and Alice Human Sacrifice (Everyone Lives, the twins find and befriend the dream from the beginning of the song, and they all go on a journey to explore Wonderland together).
Love Chart: Here, but it's only one person's take on it and with only five of the characters.
Love Dodecahedron: The Evil Seriesnote (including fan made songs). Rin is in love with Kaito, but Kaito is in love with Miku, as is Len; Haku is in a Romantic Two-Girl Friendship with Miku. According to a fan song, Miku apparently reciprocates Len's feelings before he kills her; however, this is proven incorrect by the additional information. Some fanon claims that Kaito and Meiko's cooperation is more than that, but this is generally disregarded.
Love Martyr: Len and Rin are constantly playing this game. Notable examples include the Story of Evil series.
(It's Not) World's End is an almost overwhelmingly cheerful, fast ska-ish song, but the lyrics are the thoughts of someone moments before committing suicide.
Don't Look At Me sounds like a chipper song with toy sound effects and a cute and happy-looking video. The interpretation of the lyrics so far range from suicide to abortion to drug abuse.
Another song from Kikuo-P, Let's Go to Heaven, also qualifies. This happy-sounding song heavily implies that the couple has died by the end of the song, but do apparently reunite in Heaven. Similarly to the *Hello Planet example above, exactly how sad the ending is may vary from person to person.
The Saga of A Hero. The song has a rather epic feeling to it, but the hero described in the song actually is being revered for sneaking into the girl's bathroom and taking pictures.
Deep Sea Girl starts out like this. It sounds all up beat, the chorus sounds very uplifting and hopeful, but the translation of the first stanza? "Sinking deeper and deeper into the sea of misery/ I don't even feel like opening my eyes anymore./ At this rate I could just sink all the way to the bottom/ Without ever being noticed by anyone." It gets better at the end, with the Deep Sea Girl finding love.
Senbonzakura. Upbeat song with depressing lyrics check and check.
Hello / How Are You is even more disconcerting than Hello, Planet. Despite its cute Gratuitous English and upbeat melody, the lyrics are mostly about depression, loneliness, and thoughts of suicide... though the ending is, at least, vaguely hopeful.
Waribashi Onna. The whole thing is about an odd not-Miku girl having a crazy dream about trying to break apart chopsticks, doing something that is censored, then inexplicably goes into a brief talk about politics before she starts running in space with the other vocaloids getting hit by a meteor in the background, trying to hug an angelic Miku, then waking up to eat bad noodles before getting a nosebleed from angel-Miku sticking a chopstick in her nose. It ends with an image of the girl's head on a fish body.
Mood Whiplash: Super Hero, by Len. It starts off with a boy trying to be a super hero, like the ones he seen on television. He begins by saving kittens, picking up litter, stops bullies, and saves a woman's purse. Later in the song, he tries to stop what he believes is the real enemy-the government. Unfortunately for him, he ends up killing innocent people, is sent to prison, and is known as a terrorist. "This is not how it ended on tv."
Nothing Is Scarier: While Wide Knowledge of the Late, Madness is most famous for a fanmade PV interpreting it as being a prequel to Dark Woods Circus, with everything clearly shown the original upload of the song simply had a spinning head, leaving all interpretation to the imagination, making it ten times scarier.
Not So Different: In Daughter of White, Haku finds that she's unable to kill Rin even after learning of her crimes, because Rin is just like "the old me, a tremendously lonely person".
In the related fan song Daughter of Revenge, Meiko figures out the Twin Switch, and that Len is motivated by love just like she is, but doesn't stop the execution. Seeing Rin in the crowd, Meiko reflects that "you and I are the same" and that she is every bit as wrong as the Daughter of Evil was.
Obliviously Evil: Part of what makes Kagome Kagome so tragically disturbing is that the creepy children in it seem to genuinely believe that their "game" is supposed to be fun and have no idea that what they're doing (read: tricking people into playing with them and then killing them) is wrong.
Our Vampires Are Different: The Lord of Darkness is basically a perverted anemic whose strength might be less than a regular human's. He's even kind of stupid and actually forgets the few special powers that he does have.
P.O.V. Sequel: The Evil Series. Servant of Evil tells the events of Daughter of Evil from Len's POV. And there's Daughter of White which tells the story from Haku's POV as the close friend of Miku. Miku herself also has a song telling the story from her POV, Maiden of Wood ~1000-Year Wiegenliednote "Wiegenlied" is German for "lullaby", and Handbeat Clocktower tells the story from the POV of both Kaito and Yuki.
And Leia, where an artist falls in love with a painting.
Reincarnation Romance: "A Teacher, Detained" is kind of about this. Granted the "love" between the teacher and his (male) student is platonic instead of romantic, but it's still treated as being similar to this trope.
Revenge by Proxy: A common interpretation for Meiko's character in the Evil series is that she figured out the Twin Switch, but decided to go through with the execution anyway in order to get her revenge. There is one well-known fanmade song, Daughter of Vengeance, that runs with this theory; however, it has officially been proven incorrect by the additional information.
Kagamine Len no Bousou plays this just for laughs.
Rule of Symbolism: When you get passed the Body Horror, the PV forBacterial Contamination has plenty of symbolism for the effects of bullying. In fact, the body horror in and of itself could be seen as symbolic.
Scary Musician, Harmless Music: Not quite "scary/harmless" but...Sasakure.UK's music tends to be of the "heartwrenching/emotional/philosophical" type. So you'd expect him to be the kind of wise person who broods on this sort of thing, right? Notsomuch...
Shaggy Dog Story: Owata is essentially a song about a Gakupo (or Miku) missing a meeting with a friend and couldn't tell him because his phone was dead. In the end the friend had cancelled.
Noroi no Megane is about a mysterious stranger (Gakupo) giving Rin a pair of ridiculous-looking glasses. With her eyesight already being 20/20 and the fact that the glasses only makes her surroundings look MORE distorted, she goes looking for a way to remove them. She also enlists the help of a doctor and a priest (played by Gakupo) who only adds to the load. When she finally learned that the way to take them off is hidden in a library at a secret island, she finds out that she can't read the map even though she has already prepared the boat. At the end of the song, the stranger visits her again and reveals that the glasses actually give her REFRACTION instead.
1925 makes references to classic 1925 silent films. By 1:10, Charlie Chaplin in The Gold Rush can be seen. Following up is Miku dressed as a sailor in front of what is unmistakably the poster to Battleship Potemkin. This troper didn't recognize the part that came after but has a suspicion of it also being a movie reference of some sort.
Mary in the Kagerō Project series has shades of this.
Silly Love Songs: Cupmen (song for cup ramen) is a sweet, bouncy ditty about a Lethal Chef who desperately wants to cook delicious food for the person she likes, but always ends up making instant ramen "with water heated by the power of love". He's less than pleased but eats it anyway to make her happy.
Star-Crossed Lovers: The whole point of the song magnet. Other examples include: Gumi and the guy she's singing about in The Last Revolver, Rin and Len in Prisoner/Paper Plane, Rin and Len (again) in Yume Sakura, Luka and Len in Ryuuren Kagetsu (Floating Love, Shining Moon)... I could go on. Needless to say, this trope happens a lot, especially to Rin and Len, who are really angst-happy.
The Red Shoe Parade, which is most likely a Take That to extremist religious institutions and such groups who believe that even the most monstrous of crimes are acceptable as long as it's in the name of grand justice.
Theme Tune Rap: Like the old "Pokémon Ieru Ka Na" song that was a rap with the names of all the original Japanese Pokémon, a Vocaloid collab song appeared called Isshu no pokemon ieru no ka! for the new Isshu (Unova) region Pokémon, complete with a few nifty Shout-Outs to other Pokémon songs such as the original "Ieru Ka Na" and the Lavender Town theme. Most of the Vocaloids (plus Teto) get to rap their own parts of the song; although sprites were created for Len and Luka for the video, they are notably absent.
Took a Level in Badass - In Festival of Asylum, in which everyone ends up in a group of demon exorcists (or "The Anti-Masked") against a mysterious Masked Devil, wielding guns. Gets even more badass when Miku gets possessed by the Masked Devil, and ends up using a sword against Rin's gun. (To be fair, Miku loses.)
Gumi in Saigo no Revolver in which she's a badass agent with a gun assigned to kill a man... until she falls in love with him. She still shoots him, even though she goes into depression later and implies she might commit suicide (whether that gunshot at the end was a thematic gun sound a la Noir or her actually committing suicide is up to interpretation; some maintain she never even killed him).
The song itself is ambiguous, but supplementary materials confirm that Gumi's character did in fact kill the man, and then shot herself... only to survive.
DECO*27's "Mozaik Role," which involves Gumi facing off against a shadow of herself. Complete with, at one point, getting speared in the gut and nearly killed by her alter ego. With a freakin' pair of scissors.
Judgement of Corruption. Not only does Kaito take bribes to hand down innocent verdicts, but he refuses to surrender his fortune for salvation and willingly falls into the deep pits of hell and he takes his daughter with him, resolving to once again gather fragments of the original sins and make hell into a utopia for him and his daughter.
Trademark Favorite Food: Kaito has his ice cream (Vanilla Haagen-Dazs), Meiko her sake (One Cup Ozeki), Miku and leeks, Len and bananas, Rin and oranges, Gakupo and eggplants, Luka with her octopus (Takoyaki) and tuna, Gumi with carrots, Miki with cherries, Kiyoteru with chocolate, and Yuki with apples. Some fans base their habits and sexual orientations on this, as Len is a girly boy who likes to eat bananas. The idea of a "character item" carries over to UTAU too (Teto with her french bread) as well as the fanmades and the Engloids (although the latter two rarely use food).
Troll: Some fanmades and UTAUloids are made for this exact purpose; the most famous being the VIPPERloids Kasane Teto, Yokune Ruko and Namine Ritsu, who are April's Fools jokes from 2ch. One who's less of an April's Fools and more of a Take That to some fans who make Mary Sue fancharacters is Kawaiine Kagami, the Annoyloid, who surprisingly uses Gackpoid's voice.
Akita Neru was derived from a troll.
Tei Sukone, also from 2ch, is another example. Her unoriginal design is a Take That at everyone whose UTAUloid's outfit is a Palette Swap of Miku's, her personality is a Take That at fan characters who love Len and hate Miku, and her sharingan is a Take That to Naruto fan characters who have it. Unlike Teto and the other VIPPERloids, however, she is immensely hated by those who don't realize that she was made for trolling.
Villain with Good Publicity: Meiko in the Evil series fansong Daughter Of Revenge, from a certain point of view. Sure, she did depose the evil princess who executed anyone who dared speak against her...but she also killed a comparative innocent simply because he cared about the princess, and Meiko wanted Rin to feel the pain of losing absolutely everything that one loves. In the last verse she explicitly compares herself to Rin, saying that "even if I am called a heroine, I, too, am a Daughter of Evil".
Visual Novel: "All the Songs With You in the Future," a worksafe story about Hatsune Miku, was created and sold through DLSite, and translated by fans into Chinese, Russian, and English. The same creators made a story about Rin Kagamine called "Rin ga Utau, Mirai no Neiro," and it also has on-going fan translations.
What Do You Mean, It's Not Symbolic?: Miku's What's Up? constantly has symbols flying around amongst kanji commenting on human nature. The symbols are labelled at the end, but still seem to be organized in any particular way.
What Happened to the Mouse?: We never do find out what happened to Gakupo, Meiko and Kaito in the Synchronicity trilogy. While they were last seen being defeated by Miku it's highly unlikely that they're dead, since Len survived the attack. However, they are never seen again afterward and in the final installment they only get a cameo—in a flashback.
Another song by the same team, Twilight Night, has a glimpse of a time loop where Miku bursts in onto Luka, Meiko, Kaito, Rin, Len, Gakupo, and Gumi in a party. Luka and Meiko are dead(it's never elaborated how they die or if Miku killed them), and Miku kills Len, Rin, and Kaito. The scene ends with Gumi and Gakupo running away from Miku. We never find out what happened to them.
What Measure Is A Nonhuman: In Division -> Destruction of Hatsune Miku, the creators actively try to delete Miku's humanity because they want to control her. Not to mention the countless songs that make you feel guilty for uninstalling a computer program...
Luka's Love Disease. Starts off with what seems like Luka striking up a happy relationship with someone, but then it turns out to be just daydreaming...then she finds out her crush is dating someone else and she's not pleased about it at all.
Rin in much of Putin-P's songs, especially noted at the end of I'll Give You Chocolate! although that side of her seems to have calmed down, or at least hidden in the more recent songs
In The Tailor Shop on Enbizaka, the tailor is unhappy that her lover has been unfaithful and doesn't return home to her. On three separate occasions, she sees him with different girls who all die mysteriously throughout the story. Finally, she confronts her lover Only for him to not recognize her and she murders him. It turns out he had never met her and her "lover" was already married and had two daughters, who were all murdered by the tailor.