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- October 10, 1998 - present
- IOSYS official website
- Vocal, Instrumental, Pop, Denpa, Jazz, Rock, Electronic
Some of their official/sub members have called their-selves their alias. The IOSYS website has profiles for each member.
- Main composers
- ARM (Armageddon Records) — Arrangement, lyrics, vocals, production, mastering
- D.watt, D.wat., 七条レタス (OTAKU-ELITE Recordings) — Arrangement, lyrics, production
- void, ぼいど (monoROSETTA) — Arrangement, lyrics, production, mastering
- uno (dieci beats), RoughSketch, DJ Laugh (Notebook Records) — Arrangement, production, mastering
- More members
- たくや, Hikura — Planning, Editing, MC
- はかせ — Live talk planning, moderator, MC, lyrics
- 夕野ヨシミ, YOUNO, しゃちょう (Younoumi) — Lyrics, design, planning
- 96, 黒田椋子 (HAPPY I SCREAM!!) — Lyrics, vocals, design
- あさな — Vocals
- 山本椛 (Yamamoto Momiji) — Vocals, narration
- 高井さん — Vocals
- ちよこ — Vocals, narration
- あゆ — Vocals
- quim — Vocals, MC
- MOC — Vocals, MC
- GIGYO, gigyo, 六条メガネ — Lyrics, MC
- ジャーマネ, Arima.Y — Arrangement, MC, web radio personality
- ツカツカ — Editing, video production
- あいこりん, オヌマ愛子, オミ織葉 — Lyrics, design
- tsZ — Editing
- かずとく — Photography, technology
- iTOK — Piano, arrangement, design, photography, processing
- アサミ閣下 — Illustration
- くれは — Narration
- タニタニ, 谷口雪斗 — MC
Many vocalists such as miko and 3L often participate in their work, but they're not IOSYS members.
Their musical style is very diverse, ranging from silly-sounding songs to powerful badass ones.
IOSYS is mainly formed of people living in Hokkaidō, and a few based in Kantō. It occasionally hosts guest participants, such as LUV2 (CTBR) or 溝口ゆうま (大江戸宅急便). Members of Innocent Key have been frequent guests in recent albums.
IOSYS is famous for its flash videos they release once in a while.
IOSYS made a lot of flash videos in collaboration with various studios like TETLA-POT. It's not only that they're very popular and spawned a lot of memes inside Touhou community. They became known to people outside the community, thus contributing to Touhou popularity.
The most notable one is Marisa stole the precious thing.
Rozen Maiden reference
According to the one-hundred-fifth-second version of IOSYS's web radio "Nurupo Housoukyoku", the titles of CD include several jokes of letter. Each title of the first to the eighth CD includes a kanji from one of the Rozen Maidens' names. So, at least, the titles are parodies like below.
- 東方風櫻宴 (Main Character 桜田ジュン) (Jun Sakurada)
- 東方乙女囃子 (Another name of Rozen Maiden 薔薇乙女)
- 東方月燈籠 (1st Doll 水銀燈) (Suigintou)
- 東方永雀峰 (2nd Doll 金糸雀) (Kanaria)
- 東方萃翠酒酔 (3rd Doll 翠星石) (Suiseiseki)
- 東方河想狗蒼池 (4th Doll 蒼星石) (Souseiseki)
- 東方真華神祭 (5th Doll 真紅) (Shinku)
- 東方想幽森雛 (6th Doll 雛苺) (Hinaichigo)
- 東方氷雪歌集 (7th Doll 雪華綺晶) (Kirakishou)
- 東方泡沫天獄 (OP song of Rozen Maiden: Ouvertüre 薔薇獄乙女)
- 東方超都魔転 (Villain Character ラプラスの魔) (Laplace's Demon)
Other jokes are about four-character idiom:
- 東方風櫻宴 (風)
- 東方乙女囃子 (the sound of 囃子, "hayashi", is the same as 林)
- 東方月燈籠 (the left side radical of 燈 is 火)
- 東方永雀峰 (the left side radical of 峰 is 山)
They are compounded to be read as 風林火山.
- 東方萃翠酒酔 (酒)
- 東方河想狗蒼池 (池)
- 東方真華神祭 (the upper-left side is nikuduki, 月, or meat, 肉)
- 東方想幽森雛 (森 includes 林)
They are compounded to be read as 酒池肉林 (extremely luxurious and bestial. literally, alcohol in pond and meats among trees).