As is Lusaf, either way still akward~
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As is Lusaf, either way still akward~
Quite obviously its Heroines Tower because Gilgamesh and Co are all secretly in drag. Its not shown on the poster but they're all wearing lipstick and stockings.
Based on that theory, the 5th is Cid in the Sunbreeze outfit, or Maat. Whichever is more terrifying.
Seriously though, the 5th is probably Mumor or whatever the Sunbreeze NPC is called.
While the idea of them all being in 'drag', I see them more as the heroines' cheerleaders or something along those lines as seen in the screen-shot.