Katie Ferguson

Katie Ferguson (jap. Fujimura Kazumi) is Natalie/Nagisa/Cure Black and Fergie/Fujipi's 14-year-old daughter. She is very much like her mother; as she loves sports, particularly judo (a Japanese martial art), falls in love at first sight, and has a big appetite as well as is gluttonous. Katie is very fiery and hot-headed, and is rather weak in academics but specializes in math as she wants to be a video game developer. Unlike Natalie, Katie is quite tomboyish. Her best friends are Rachel/Reiko and Sophie/Shizuka, and she has a crush on Hiroki. Katie has great combat skills and is quite capable of looking after herself even when not in Cure form. Katie is partnered with Mepple and can, when with Sophie, transform into the new Cure Black.

Katie's appearance is modeled after Mikoto Misaka, the protagonist of the anime A Certain Scientific Railgun.