There are two Star Wars stage shows (March of the First Order and A Galaxy Far, Far Away) that run in the afternoons at DHS. There are several performances of each - alternating on the half-hour. The March has Captain Phasma and several First Order Stormtroopers. GFFA has additional characters (Vader, Darth Maul, Kylo, C-3PO, R2-D2, Rey, Chewbacca, Jango Fett, Boba Fett, etc.). Other than the characters who meet in the Launch Bay, GFFA characters don't do M&Gs (so you can see Boba Fett in GFFA but no personal photos with him). None of the characters do autographs to my knowledge - they stay "in character" for guest interactions as though they were part of this world. You also can find First Order troopers patrolling the area around Launch Bay. They may "hassle" you if you're wearing a Rebellion-themed t-shirt or threaten to impound your cell phone if you take pictures of them (happened to me) - but they don't pose for pictures with you or do autographs.