Karolina is the only extraterrestrial in the group, except for a period of time when her Skrull fiancée, Xavin, becomes part of the team. "Runaways" creator Brian K. Vaughan played a significant role in the character's subsequent development as well as artist/writer Adrian Alphona, both of whom spent most of the first volume of the series hinting that Karolina was romantically attracted to fellow member Nico Minoru. By "Runaways"'s fourth relaunch, Karolina's storyline picks up with her relationship with Lightspeed of Power Pack referenced in "Avengers Academy".