Captain Jack Harkness
Discussing whether his character could ever find a soulmate, John Barrowman refutes that Jack "likes everybody, and his love for each person is different".  He believes that Jack does harbour romantic feelings toward the Doctor, but "would never take that beyond infatuation" and "would never let the Doctor know".  Barrowman describes Jack's love for Ianto as "lustful", and if he ever were to settle down with him, he would "let Ianto know that he [Jack] has to play around on the side". John Barrowman and Gareth David-Lloyd have also opined that Jack's relationship with Ianto has however brought out Jack's empathy, and helped to ground him. In contrast, if he settled down with Gwen, "he'd have to commit completely" to her; this is why he does not act on his feelings for her, because even though she would let him flirt with other people, he could "never afford to do anything more Eve Myles, who portrays Gwen, describes theirs as a "palpable love" and opines that "with Jack and Gwen, it’s the real thing and they’re going to make you wait for that." Torchwood Series Two sees Jack promise both Gwen and Ianto that they were the reason he returned to Cardiff. Barrowman claims that Jack also "fancies" fellow companion Martha Jones, admiring her "tenacity" and willingness to "spat with him", and describes Jack's love for Toshiko and Owen as "fatherly", stating "He was guiding them. That's why it was so devastating for him to lose them." Offering reasons why Jack could never find "The One", Barrowman brings up the character's immortality. "He always loses them.  He outlives them.  They die.  He watches them get old. That bothered him in Series One [of Torchwood], but now he's come to terms with that, I think... so now he just sleeps around!"