On 13 January 2018, it was announced that the first downloadable character for this game would be Vayne Carudas Solidor, the main antagonist from Final Fantasy XII (2006) that was originally voiced by Nobuo Tobita in the Japanese version, and Elijah Alexander in the English version. The same voice actors returned to reprise this role.
On 15 May 2018, it was announced that the second downloadable character would be Locke Cole, one of the key protagonists from Final Fantasy VI (1994). As this character had never been voiced before, the role was given to Yuki Ono and Jonathan von Mering in the Japanese and English versions respectively.
On 10 July 2018, it was announced that the third downloadable character would be Rinoa Heartilly, the deuteragonist from Final Fantasy VIII (1999). Like the previously released character, this character has never been voiced, and finding a suitable voice actress was integral to the developer's specifications. The role was eventually given to Kana Hanazawa in the Japanese version, and would be dubbed by Skyler Davenport in the English version.