User blog comment:Xouzoura/What colour of haki do you think Luffy will decide to improve the most ?/@comment-2106651-20100830204449

I think color of armaments as well, because when he was first told what it was he was really excited about being able to hit logia users like smoker, so he would probably prefer that one. I don't think he'll use observation because that would make alot of his fights too easy