All right, so Im cheating my categories a bit. Captain Jack Harkness isnt a constant companion through a season, and neither is River Song, but they both keep showing up, and theyre both too fantastic to exclude, anyway. As far as omnisexual time agents go, if there are any others out there I havent seen Torchwood, so I wouldnt know Captain Jack would definitely top the list. Hes as charming as they come (and yes, he would definitely insert some perverted joke right there) and is always, always available for anything and anyone. Normally I would find this a bit off-putting, but its Captain Jack; he smiles and suddenly youre not bothered by anything. Of course, since his appearances in the show are a bit sporadic he doesnt get the chance to become the most well-developed character (Im assuming thats done a bit more thoroughly in Torchwood), hence why hes near the bottom of the list; its not because of dislike (thats coming up). So, while hes not as three-dimensional as he should be for how long the character has been in the show, hes as charming as ever, and everyones favorite captain.