BLUE - rivale is a character song album release featuring eight songs sung by rival characters.
- "End:Res" - Mukuro Rokudo (Toshinobu Iida)
- "FLAMING RAGE" - Xanxus (Masanori Ikeda)
- "BREAK OUT" - Superbia Squalo (Hiroki Takahashi)
- "bloody prince" - Belphegor (Yuki Fujiwara)
- "Special illusion" - Fran (Sachi Kokuryu)
- "PARADE" - Byakuran (Takanori Ooyama)
- "Simulation" - Shoichi Irie & Spanner (Toshiyuki Toyonaga & Kenjiro Tsuda)
- "Kyouki no Hana" - Kikyo (Kazuki Kato)
- It is the partner album to RED - famiglia.
- Though predominantly sung by Belphegor, and is not considered a duet but one of his character songs, bloody prince also features a brief cameo from Lussuria (Koichiro Yuzawa).
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