My guess:
Kū
空 Kū or sora, most often translated as "Void", but also meaning "sky" or "Heaven", represents those things beyond our everyday experience, particularly those things composed of pure energy. Bodily, kū represents spirit, thought, and creative energy. It represents our ability to think and to communicate, as well as our creativity. It can also be associated with power, creativity, spontaneity, and inventiveness.
Kū is of particular importance as the highest of the elements. In martial arts, particularly in fictional tales where the fighting discipline is blended with magic or the occult, one often invokes the power of the Void to connect to the quintessential creative energy of the world. A warrior properly attuned to the Void can sense his surrounding and act without thinking, and without using his physical senses
Source:
http://en.wikipedia.org/wiki/Five_elements_(Japanese_philosophy)
Reason for guess:
A warrior properly attuned to the Void can
sense his surrounding and act without thinking, and without using his physical senses
-Basically this explains the reason why Oda drew the ear.
represents those things
beyond our everyday experience, particularly those things
composed of pure energy.
-I think we need something dif than light and ice, "pure energy" . Making akainu special and we all know he needs to be special, considering being --the last admiral that haven't showed us his df.
where the fighting discipline is blended with
magic or the occult, one often invokes the power of the Void to connect to the
quintessential creative energy of the world.
-Magicians and people that have to do with occult are rare in one piece, that's why
& To top it all up, the name of the fruit, Void Void Mi. Sora sora mi.
Its an
element in japan too.
EDITED: or the Air air fruit, considering he wear a rose shirt. I mean, all things in the world need oxygen right? Plants need em for photosynthesis..etc.
And air fruit is gonna be real powerful, as in an sbs oda said he's the strongest out of the admirals.