Square Enix revealed that Gilgamesh from FFV, and other villains from the past titles will be coming in future as download characters. To obtain these characters you have to defeat them in the Coliseum a few times until they drop their crystals; with the exception of Sazh, who you can get as a playable “monster” once you obtained 30 Fortune Medals in his download episode. Also joining the cast in the future will be Jihl Nabaat from Final Fantasy XIII.
Source: Siliconera
