Kula Diamond (クーラ・ダイアモンド) first appeares as the sub-boss in The King of Fighters 2000; she enters as a normal participant in her other appearances. Her original hair color is chestnut brown, but it changes to a light blue when she activates her ice powers. She was designed to be the antagonistic foil to K', in an attempt to better develop characteristics of the NESTS cartel. She was specially made with attempts to depict a "14-year-old girl" with "appropriately girlish" gestures with help from newly hired female staff.

She is a being created by NESTS[20] to exterminate the cartel's traitor, K'. Despite the fact that their subject was a mindless puppet with no sign of emotions, the NESTS cartel created an android called Candy Diamond, to monitor Kula's behavior and to ensure that she would accomplish her missions. When Kula destroys the main Zero Cannon, Candy shields her descent from space, sacrificing her body as it is badly burned from Earth's atmosphere. Diana, a former top executive of NESTS acts as the girl's guardian in the series. Kula is often ordered to exterminate other traitors to NESTS but has been known to disobey her orders for the sake of others. After NESTS' destruction, she allies on friendly terms with her target, K' and his companions. Her seiyu is Yumi Kakazu, and her voice actress in English-language adaptations is Kat Cassteneda.