Tifa follows the Boobs of Steel trope canonically: she has the largest endowments, she's the physical fighter. Of course cosplayers have the opportunity to twist that trope and produce unique circumstances. Acuos decided: "Why not be Aeris?"

Marcia tries to mull in her gamer brain how this situation happened.

Art by:  marauder6272
Acuos and Marcia by:  brunicus
Aeris and Tifa by: Square