Just call Ghost bandleader Tobias Forge Obi-Wan Kenobi. Because the current look of the stage costume he designed for his backing group of Nameless Ghouls was partially inspired by a creature in the Star Wars universe, as the rocker revealed this week. Ghost debuted the Ghouls’ new getup at the band’s IMPERA tour kickoff in January. IMPERA, the theatrical rock group’s fifth studio album that emerged on March 1, contains the singles “Twenties,” “Call Me Little Sunshine” and “Hunter’s Moon.” The musicians’ previous stage outfit featured shiny silver masks with human facial features (but no mouth…