I still think that U is not R. . . For someone who was born and raised in English language, how come in the future she has broken English?
Like the "Kurse SeeD" not "Curse SeeD"
I think square soft wants to indicate that Ultimecia has difficulty in saying "C" while Rinoa never have difficulty in saying "C" in English.

Ever considered that Ultimecia is Rinoa's and Squall's daughter or grand daughter in the future?