The second sub-series of the beatmania series of rhythm games, later becoming part of the [[bemani]] series. Unlike beatmania and beatmania III, IIDX has continued getting games to the present day. 

h4. Characters
h5. Player
* [[Qpro_(beatmania)|]]
* [[Tran_(beatmania)|]]

h5. ROOTS26, designed by [[Goli Matsumoto]] 
* [[Yuz_(beatmania)|]] (Rokuhara Kabuto)
* [[Mizushiro Celica]]
* [[Kitami Erika]]
* [[Duel_(beatmania)|]] (Leonard Baxter)
* [[Siren_(beatmania)|]]
* [[Nix_(beatmania)|]]
* [[Q-Jack]] (Quisling Jack)
* [[Nyah]] (Wong Xiaozhen)
* [[Xiatian (beatmania iidx)|]]
* [[Shiki_(beatmania)|]]
* [[K-na]] (Mitsui Keina)
* [[Zilch_(beatmania)|]]
* Lilith ([[Hinazuki Ririna]])
* [[Shem]] (Hinazuki Seina)
* [[Shilow]] (Kanzaki Shirou)
* [[Kanzaki Saya]]
* [[Ereki_(beatmania)|Kanzaki Ereki]] 
* [[Daruma (beatmania)|]] (Tatsuma Hayuki)
* [[Hishimiya Tsugaru]]
* [[Umegiri Iroha]]
* [[Umegiri Hifumi]]
* [[Umegiri Ameto]]
* [[Eiri (beatmania iidx)|]]
* [[Kurogane Tekka]]
* [[DJ Sakura|Otomo Sakura]] 
* [[Fireboy_(beatmania)|]]
* [[Himiko (beatmania)|]]

h5. Song-specific
* [[Himmel_(beatmania_iidx)|]]
* [[Creep_(beatmania_iidx)|]]
* [[Faula_(beatmania)|]]
* [[Sumomo_(beatmania)|]]
* [[Chronos_(beatmania)|]]
* [[Kairos]]
* [[Elpis_(beatmania_iidx)|]]
* [[Rche_(beatmania)|]]
* [[Aegis_(beatmania)|]]
* [[Mei_(beatmania)|]]
* [[Sirius_(beatmania)|]]
* [[Ashemu]]
* [[L'erisia]]
* [[Solar Eclipse (bemani)|]]
* [[Dr. Phi]]
* [[Yamashina Shizuku]]
* [[Yamashina Kanade]]
beatmaniaIIDX IIDX 弐寺 beatmaniart_iidx IIDX_art