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Hmmm.....i'm became more suspicious with Megaman X creator team. Maybe they planned to make Zero as "blonde sister" for X before changed her into "brother", like Vamp original design plan from Metal Gear series. Remember? Every Megaman blue heroes have their own "blonde sister" as partner, like original Rock have Roll, Volnutt have Roll Caskett, Megaman EXE have Roll EXE and more.