The Full Metal Alchemist event just started in Netmarble Japan's Knights Chronicle and players can collect and play as Edward, Alphonse, Roy, Riza, and Lust. Players who start a fresh account will be able to roll the new FMA Gacha right away and obtain an event character. I actually made a new account just to roll and try out the new characters. They added a button to skip the tutorial so rerolling should be a tiny bit faster now.
Alphonse Elric is obtainable through the Gacha or free from the 7-day consecutive login bonus. The special character Lust can only be obtained by defeating her and collecting her puzzle pieces in the extremely challenging raid where she comes back to life multiple times! The game has been out for about a month now and I finally got my Knights character from the 30-day login bonus. I didn't really have any gems to roll the FMA Gacha, so I ended up making an alt to make a video of the new characters. Their outfits will change as you evolve them from different 4 to 5 to 6 star. It also looks like you're guaranteed to get at least one FMA character per 300 gem pull. Happy collecting or rerolling~!?
Game Site: http://knights.netmarble.jp/