|This is part of the Sky Pretty Cure Series!|
|Season||Sky Pretty Cure ~Rainbow Star~|
Black Diamond is one of the main villains from Sky Pretty Cure ~Rainbow Star~. Black Diamond is the main villian of this season. She was created by Princess Break, after her "family" got defeated by Pretty Cure. As the girls refuse to call her by her 'real' name, they keep calling her Kuro (クロ Kuro?).
- Ruriri - Ruriri and Black Diamond act towards eachother like sisters. Not very surprising is that BlaDia cares more for Ruriri than for any of the others. Even though they were created by Break, both Ruriri and BlaDia, will disobey her when needed.
Black (ブラック?) - Black is the very darkest color owing to the absence of or complete absorption of light; the opposite of white.
Diamond (ダイヤモンド?) - From the English word diamond for the clear colourless precious stone, the birthstone of April. It is derived from Late Latin diamas, from Latin adamas, which is of Greek origin meaning "invincible, untamed".
Kuro (クロ?) - Kuro, from the Japanese word Kuro (黒?) meaning "black". The girls decided to call her Kuro, since they couldn' call her Diamond and Low would have been against calling her Kurai, so they went with black.
- Princess Break may be gave her the name Diamond because of Shirosora Diamond, who fell in love with Low and took him to her side.
- Black Diamond shares her seiyuu with Aono Miki from Fresh Pretty Cure!.