It seems to me that so much people just say Ghirahim has no chance for being a "one off villain", yet apparently Vaati cannot be categorized in that group.
because he's not. He has appeared in three games and was an important force in the foursword chronicles.
Impa has been important in many different games.
Girahim is... just in Skyward Sword with even less Importance than Fi.
I think it's a shame because I wanted him to play a bigger role, but we can't have it all, can we.
Looking at Greninja, Rosalina, Mii Fighter, Wii Fit Trainer, Robin and Lucina, it means that not just popularity matters.
Where is Chrom? Sothe? Micaiah?
I have a feeling we will see more emphasis on uniqueness this time around, especially since Sakurai mentioned in one of his earliest interviews: simply adding more characters is not enough.
I agree with his statement. I see now that he meant adding unique characters.
This puts Vaati and even Yuga above Impa and Girahim