Field Country Filler = Donkey Doo
Mizuki & Baka Bros. Filler = Purebred, stir-fried shit
Bikouchuu Filler = Crap
Team Gai Filler = .. 'eh, still haven't seen it.

But, crap is more welcomed than anything relating to Mizuki or Fuujin & Raijin, so lighten up. How much more filler can they really come up? The Kakashi Gaiden's coming soon ..