Pull rates for characters on here are trash not to mention the only type of luck you can get to get the new units is if you pay for enough Chrono crystals and if you don't have good enough units then you can't even play pvp without being destroyed by any zenkai or LF units. You can't even grind for Chronos the most you can get from the missions is energy and skip tickets which you can easily get over 1,000 of. Overall this game isn't forgiving for free to play players