My first instinct was to go for somebody I'd like to be stuck on a deserted island with, like Ianto Jones or Jack Harkness. I thought of the Doctor, but he has the TARDIS so he wouldn't be stranded anywhere unless somebody took it.

Then I came down to Earth and thought... Mac! If anybody could figure out how to get out of the island, or make the most of it, it would be MacGyver. We'd be building houses out of coconut shells and grass, and radios out of sea glass. I dunno. Something. Plus he's cute too.