Well, I remember reading somewhere that the Blue Pheasant (Ao Kiji), Yellow Monkey (Kizaru) and Red Dog (Akainu) are characters from some Japanese or Chinese epic. Interestingly they seem to have personalities similar to their namesakes. Aokiji is lazy and laid back, and Kizaru tends to be a bit goofy. In my opinion, its a misconception to associate colour with their respective logia. However, when one thinks of Ice, the colors white and blue come to mind most prominently. Same for the colors white and yellow for light. But saying Ice is blue and Light is yellow, is inaccurate.
That being said, I picture Akainu's ability to be cruel and bordering on evil. That should go well with what his personality might be considering his views on Absolute Justice. Maybe some kind of Blood or Magma/Lava Fruit. I prefer blood, 'cause lava kinda looks closer to Ace's Fire fruit.
Oh, and Dragon probably has the Wind or Weather fruit.