Misumi Nagisa (or Natalie Blackstone in the English dub), is one of the main characters in the series Pretty Cure. Because of her role as narrator and the amount of attention she gets in the series, she is considered the main heroine. Her Pretty Cure ego is Cure Black. Although she was previously almost unaware of her existence, Natalie eventually became best friends with Hannah Whitehouse (Cure White) because of their shared roles as Pretty Cure, admiring her for her intelligence, kindness and understanding.
Although she is sporty, Natalie is actually more girly and image conscious. She has a large collection of stuffed animals and is weak in academics, but makes up for it with pure spirit and energy as well as in lacrosse. She also has a large appetite and loves to eat chocolate and Alex takoyaki and, according to Hannah, foods with the word "yaki" in the name. She likes shopping but tends to squander her money and ends up having none when she needs it most. She also loves playing on the grass and sunny days, and she hates fighting with her friends. Natalie has a crush on Honoka's childhood friend, Shawn "Fergie" Ferguson and gets flustered whenever he is around. To her dismay, Natalie is more popular with the girls than the boys, and is sometimes shown to be jealous toward Hannah, who gets confessions and love letters from boys more than twice a month.
Natalie has a great sense of justice, but it is hidden inside of her and only comes out when someone is in danger. She hates that innocent people get hurt for things they had nothing to do with. Natalie is also an old friend of Serena (Sailor Moon), Emily (Glitter Lucky) and Zoey Hanson.