Just conjecture but Gaius or Nero would be Chaos, and probably Yda, Y'shtola, or Thancred for Cosmos. Y'shtola's already the "crossover mascot" thanks to Theatrhythm, but since both of FFXI's Cosmos representatives veer on the goofy side, Yda isn't too far fetched a guess. Yda and Papalymo together would be awesome :P