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In addition to one confirmed voice actor for 'χ[chi] Back Cover' in 'Kingdom Hearts HD 2.8 Final Chapter Prologue', another voice actor confirmation has been made for the entry, with former Miss America contestant Karissa Lee Staples voicing Foreteller Invi. What's interesting is that Staples apparently confirmed it on Twitter before 2.8's E3 trailer was even released:

If you look closely at the blurry screen image from the Tweeted photo, you can see a scene that Staples recorded involving Invi speaking with Aced.

Source: KHInsider