Michelle and The Doctor (Ten)
"Oh, there are lots of different types here, ma'am," he said, softly, as he watched Clark Kent beat the Leprechaun. "Though I am only certain of a few different types -- mainly aliens. There are some humans here, though." Like Martha and Ianto.
"And no, I do not believe anyone actually enjoys it," he mused. "It's just easier on some." Like possibly Kenny, though The Doctor didn't know the man.