I know a lot of the voices in the game are actually "vocaloids" and not real people (notably Pharos Sirius - I asked!), but the Rak'tika one sounds way too real.

That said, I wouldn't be surprised if it was some rando from within Square Enix that Souken grabbed. "Hey, I know you're a marketing analyst, but someone said you have a nice contralto? Sing this."