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cosMo, also called Bousou-P after one of his more popular works, is an animator and prominent Vocaloid composer. He has become famous in the Vocaloid community for producing a vast number of extremely fast-tempo songs (often over 200 bpm), pushing the software to its limits. He has composed music sung by Hatsune Miku, Kagamine Rin and Len, Megurine Luka, Gumi, and Gakupo; while most of cosMo's works are Miku songs, he claims that his favorite Vocaloid is Kagamine Len.

He does a number of his illustrations himself, and also has personally covered a number of Vocaloid songs. cosMo is said to have an unusually "cute" voice for a male singer. (Judge for yourself.) He has recently released a Vocaloid cover CD called "What Do You Mean You're Gonna Sing?!!", in which he covers a number of his own works.

cosMo has produced two series--the Fantastic Garden series, and The Disappearance of Hatsune Miku, which is responsible for his leap to fame. He has produced a number of mini-albums, and his songs are often included in Miku compilation CDs. Fantastic Garden is known for being extremely surrealist, and The Disappearance of Hatsune Miku chronicles the experience of what life is like for an actual Vocaloid program with a merciless eye. The Disappearance series, along with a few new songs, has been released as a full-length CD which will also be cosMo's major debut.

The Disappearance series includes:

The Fantastic Garden series includes:

  • The Girl's Fantastic Garden
  • Miku, Piano, and Fantasy
  • Magical Girl Radical Paint
  • Anti-The Fantastic Garden
  • Miyako Wasure
  • Capsule
  • At the Old Capital of Atriesta

The Dr. Realist series includes:

  • Runaway Boy and the Lost Girl (Gumi)
  • The Nun and the Idol (Miku)
  • Dr. Realist (Gakupo)
  • The Innocent Girl and the Grown-Up World (Gumi)
  • Adventure Girl and Game of Miniature Garden (Miku)

Other songs and covers:

  • Song Box (one version each for Miku, the Kagamines, and Luka)
  • Dennoh Skill
  • Packaged (cover)
  • Meltdown -Hard RK Mix- (cover)
  • Just Be Friends -Hard RK Mix- (cover)
  • R-18
    • R-25 (self-cover)
  • Dokubou Stellar Theater
  • Magical Kitty Len Len
  • Rainbow Adventure NTG Remake (cover)
  • The Rampage of Kagamine Len (a spoof of "The Rampage of Hatsune Miku")
  • Melt -Soft LM Mix- (cover)

Tropes utilized in cosMo's songs:

  • A God Am I: Miku in Disappearance.
  • Alternate Character Reading: Anti The Fantastic Garden is spelled with the kanji for "The Girl's Fantastic Garden" in reverse. Often abused in Disappearance songs' lyrics.
  • Anachronic Order: On the Disappearance CD, Zero is track 8, and is presented as Miku remembering her own first startup.
  • Ax Crazy: The resurrected virus!Miku.
  • BSOD Song: You could say that this is a specialty of his...
  • Body Horror: The creation of Append is described as some unholy mix of rape and vivisection.
  • Bokukko: Miku. The Disappearance series explains that this is the pronoun of choice for all Vocaloids because "boku" is a homonym for the abbreviation VOC. in Japanese.
  • Butt Monkey: Len.
  • Came Back Wrong: Miku in Hyper∞lation isn't quite the same anymore...
  • Canon Welding
  • Concept Album
  • Death by Cameo: Runaway Boy and the Lost Girl features short cameos by the Fantastic Garden writer, Rin and Len from Atriesta, the girl from R-18, and Lucy (the little girl from Capsule). Lucy is sitting on top of a skyscraper. She's so enamored by her drug-induced hallucinations that she falls off.
  • Driven to Suicide: The end of Runaway Boy and the Lost Girl
  • Earn Your Happy Ending
  • Last-Note Nightmare: Demise and Runaway Boy and the Lost Girl.
  • Lucky Charms Title: Hyper∞lation, Capsule.
  • Mission Control: Luka in Rainbow Adventure NTG Remake.
  • Motor Mouth
  • Multiple Endings: Demise is the "Worst End", Disappearance is the "Dead End" (and Hyper∞lation is its sequel), is the "True End", and Intense Song is the "IN Fi NTY Happy End".
  • Refuge in Audacity: Capsule is about an entire kingdom that's falling into ruin because all the adults spend their days in a drugged haze, from the perspective of a little girl who only manages to find happiness by joining them in the pill-popping action. There aren't many media where you can get away with stories like this, let alone have them become popular.
  • Take That Me: Both Miku and Len's Bousou songs have them addressing cosMo as something of a pervert with delusions of grandeur (Len even asks straight-out if he thought he was buying an eroge when he bought them!). The lines of nonsense kanji that Miku screams in Hyper∞lation could also be lampooning how little sense all those high-speed lyrics tend to make.
  • Tsundere: Rin.
  • Villain Song: Dr. Realist
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