Akuno-P or mothy (an acronym for "Master of the Heavenly Yard") is a Vocaloid producer who is famous for his complex stories made using the Vocaloid program as well as making manga, light novels, and short stories. His works include the Evillious Chronicles (his most noted work, with all related tropes and song lists on its page), the Torture Tower Never Sleeps series, and various other miscellaneous works. Here are his Nico Nico and Youtube accounts, as well as his blog and Twitter
Abusive Parents: The father in Flame of Yellow Phosphorus is heavily implied to be this.
Aerith and Bob / As Long as It Sounds Foreign: mothy really tries to put in a "Western" feel (including the style choice of his songs), but the names...sometimes just sound plain bizarre even from a Western standpoint. Clarith? Gallerian? Yukina?
That's not even getting into Milky, Pollo, and Neruneru.
Animated Actors: Mothy seems to treat the Vocaloids this way, and each is credited for the role of the character in the PVs they're in. For example, Len playing both Allen and Remy in Servant of Evil and The 5th Pierrot respectively.
Artificial Human: The two Rins from Screws Clockwork and Pride. They are implied to be life-size, living toys.
Clock Punk: A common theme of the Evillious Chronicles, as well as some of mothy's minor songs like "Screws, Clockwork, and Pride".
Color-Coded for Your Convenience: A common trope in mothy's songs since they're sung by Vocaloids. You can basically guess what the characters look like just from a color. For example, if there's a girl wearing green, she probably has teal eyes and pigtails.
Crapsack World: In the Sleepless Torture Tower series. You can probably guess from the name why it qualifies.
Then there's "Screws, Gears and Pride" (the two protagonists are viewed as inferior and thrown into a landfill) and "Watching Us" (a polluted city where people can fall terminally ill just by breathing).
Despair Speech: Near the end of "White Brick and Black Mourning Dress", when the singer realizes she never got the hand mirror that was promised to her if she could "remain pure." She concludes she must be corrupted and worthless.
The Dog Bites Back: In Flame of Yellow Phosphorus, Rin's father kicks her out of the house and refuses to let her eat anything until she sells all the matches. She burns the house down with him still inside.
Downer Ending: Flame of Yellow Phosphorus also counts. The singer burns to death.
Green Aesop: Watching Us. Interestingly, it doesn't so much go for showing the effect the smog spewing factory has on the environment, as it does the effects on the people in the town; Len gets severelyill from all the smog and Rin has to work hard in a sweatshop to pay off the hospital bills. Luka, a personified star, sees and hears all this and notices how everyone wishes on stars, including the twins. She then expresses guilt that she is unable to give them their wishes and desperately wishes herselfthat she could help them.
How We Got Here: Flame of Yellow Phosphorus opens with Rin being burned at the stake, then flashes back to what led to her execution.
Innocent Flower Girl: The girl in Flame of Yellow Phosphorus, as a tribute of the Little Matchstick Girl. Whether her innocence is real or not, depends on how you see her action.
Karmic Death / Death by Irony: Rin from Flame of Yellow Phosphorus. She burns down her house with her father still inside, and is in turn executed because of the aforementioned killing via death by fire.
Kill It with Fire: In the beginning of Flame of Yellow Phosphorus, Rin is shown being burned at the stake. It's later revealed that she's being executed for setting fire to her home and killing her father in the process.
Lyrical Dissonance: Mothy REALLY loves this trope, to the point that when he makes a "cute" song fans can't believe it, to the point that some even pick the lyrics apart, piece by piece to find some sign of a tragedy in the song. The shadow parade really takes the cake though.
Obliviously Evil: The three sisters from Sleepless Torture Tower don't seem to think it's wrong to capture people and torture them until they either die or begin to enjoy it. (Granted, they seem to have it really in for people who are actually DESERVING of torture, but still.)
Reality Ensues: A weird example in "Watching Us", since it still has a supernatural element; wishing on stars doesn't really work. You can wish for miracles all you want, you'll never get them.
Religion of Evil: The "Ugly God" the Lord of Torture and his daughters worship in Sleepless Torture Tower.
Stealth Pun / Visual Pun: From Flame of Yellow Phosphorus. Rin was burnt on stake, just like how rinnote Japanese for phosphorus on her matches burnt. Combine it with the song's title and you got a hell of pun for this tear-jerking song.
Take Up My Sword: The three sisters of The Sleepless Torture Tower are mentioned to have picked up their duties in honour of their father.
Title Drop: More often than not, the last line of the chorus of The Sleeples Torture Tower is "goumontou wa nemuranai", which is the Japanese title of the song.
Twist Ending: Mothy loves this trope. For example, Wendy is a song about the same character from Peter Pan singing about flying off with Peter—and then in the end when she jumps out the window she falls to her death.
Unwanted Spouse: Played for Drama at the end of White Brick and Mourning Dress. When the girl grew up she married someone she didn't love and lived an unhappy life, and the only thing that made her happy was her son.
Villain Song: Over half of all the songs mothy has ever made were the from the perspective of a villain.
What Measure Is a Non-Human?: The two Rins in Screws Clockwork and Pride. They are sentient toys which were viewed as defective because they couldn't live up to the ridiculously high standards of the very arrogant people of the future and ended up in a landfill because of it.