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In the concept art of Resident Evil 5, Excella is shown wearing a pink business suit with her hair let down, different from her persona in the final build. Furthermore, the Excella-Uroboros Aheri transformation was to be completely averted: originally, she was going to die at the literal hands of a Tyrant-esque creature, as evidenced by official artwork.
Originally Excella was planned to be a secretary working for Tricell, but the creators decided to make her the CEO of the company instead.
Excella's age in The Mercenaries Reunion is listed as a "trade secret".