Board Thread:Naruto Discussions/@comment-26704954-20150730051953/@comment-26388300-20150730060932

I would normally say the Kyuubi, but how often would he actually be called upon? I mean, how many battles does a shinobi get into that requires the aid of a freaking Tailed Beast? "What up, Kyuubi... yeah, sorry, been a few years. Help me fight this rogue kage, and then vanish from my sight for another five years while I kill lots of nameless ninja."

Joking aside, and ignoring the obvious answer being the Nine-Tails, I'm giving my vote to Sasuke's hawk. Flying is a dream of mine; this would also be advantageous in combat.