Koga's daughter Janine
Janine, or Anzu, or Jim Bob for all I know...is Koga's daughter. (In the Japanese version I hear that she is his sister. X_x) So long as she isn't both I'm fine with it. Anyway she takes over the Fuschia City Gym when Koga leaves to become a member of the Elite Four. (Which is really five but who's counting?) 

Much like her father she uses ninja tricks to fool her enemies and pokemon challengers.  In the video game we find out that Janine has a lot of followers in her gym that are dressed to look just like her. This is a trick and if you choose the wrong "Janine" you'll have to fight that trainer. (Since you can't run away from a pokemon battle) This weakens her oppenets for her. Or at the very least causes you to take more time to get to her during the game.

She looks a lot like her father and uses the same pokemon as he does. She is a true ninja although who her mother is a mystery and never said during the game.  I hope will get to see her during the anime or one of the mangas. That should be a good episode. ^_^

Anyway she is going to have new cards coming out soon. So keep an eye out for them. I certainly will.