You might be familiar with John Barrowman from the long-running sci-fi classic “Doctor Who.” Certainly, you’re aware that he’s a bit of a character. Born in Scotland and raised in Illinois, he’s got a cosmopolitan outlook on life. He’s perfectly happy walking through Comic-Con either as himself or dressed up in full gender-bending regalia, complete with a costume corset. He’s been in theatre and had a variety of roles in TV before really hitting his stride in sci-fi, most noteworthy in the Whovian spin-off “Torchwood.” Today, he’s a fan favorite at Comic-Con, not just for his sunny attitude but also for his crowd-pleasing cosplays.