Perhaps also all of the overpowered characters who only get screentime in a flashback, or when brought back to life.
Now that's messed up. Just think about it.
At the very beginning of the Naruto story...
Second Mizukage: So hey Kishimoto-boy, when do I make my debut?
Muu: ^ What he said.
Third Raikage: Thirded. I'm also curious as to when I get panel time.
Kishimoto: Oh...um...sorry guys. You guys don't make an appearance until like Chapter 500, and you're zombie shinobi.
Second Mizukage:

WTF?
Muu: =>_<=....depressing...
Third Raikage: We've been trolled...and it's only the first episode!