Quote Originally Posted by Celestia View Post
There is a big difference between a minor character who hasn't appeared in a while and a character who was specifically built up as being important to the story and has been completely irrelevant for years after. You'll note that no one is joking/complaining that Dan forgot Rhea.
Rhea was one of the stars of the "Wrong Answers Only" Q&A from the NP strip three years ago, less than your five year cut-off.