Hardest Fighting Game Character to Learn

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I've been playing quite a few fighting games lately, and I was wondering out of all the fighting games you've played, who do you think is the hardest to master? A few from my list:

 

-Gen (Street Fighter 4): People who have mastered him make him fly everywhere, but mastering him is just plain confusing due to his stance system.

 

-Lei (Tekken): Like Gen, only difficulty is multiplied by ten since he has about 5 or 6 stances to keep track of.

 

-Akira (Virtua Fighter): It's tempting to put half the cast from VF on here, but I've yet to play a character in any game that requires you to let go of a button after 1 frame to correctly execute a move.