User blog comment:Nino ronin/I Hope Oda will give Vice Admiral Garp some Devil Fruit/@comment-67.235.38.236-20100325052536

I don't recall any chapters or page numbers, so this could be completely wrong, but I think we've seen Garp swimming before.

Though if I were to choose... The "air" logia. It is just the last great logia left unclaimed...