The only scent that I match with characters is when I cosplayed Kadaj. The costume I wore had a specific smell, like new leather, and since then, whenever I smell that scent, it reminds me of Kadaj, and Kumoricon '07.
But then there's Light, too... whenever I smell fried chicken or honey mustard, I think of him, because somehow my tie, jacket, and shirt were covered in it when I got up to Akicon to put it on, and when we washed it off and dried it, it smelt like fried chicken. DX