User blog comment:King Flurry51/Izzy:Popular Underdog or Forgotten All Star?/@comment-4393544-20141018215702

The main reason why Izzy isn't used much is that her voice actress (Katie Crown) is too busy doing voice work for the Cartoon Network show Clarence (She plays the main characters's mom)

She is neither Underdog or All-Star, she is more comedic cannon fodder (there needs to be more eccentric female characters on this show)