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Show spoilers

A second-year student in the piloting department, who transferred to the school from Mercury. Suletta is timid and somewhat lacks communication skills.

She is the pilot of the Gundam Aerial developed on Mercury.

The show's official chronology contains some inconsistencies regarding Suletta's supposed age, as despite her 16th birthday at school entry at the beginning of the show, in the prologue, little Ericht reported her 4-year-old age during the events that happened 21 years ago. Episodes 14, 16 and 18 brings some clarity to this when it is revealed that the real Ericht did not survive the events of the Prologue and Prospera was forced to transfer her mind to the future Aerial, while Suletta are revealed to be a younger clone of Ericht under the guise of "Eleanor's other daughter".
A prequel novel written by the show's writer reveals that Suletta's mother had planned from the very beginning for Suletta to take the position of holder by winning the duel for Miorine's hand and thereby allowing her to gain control of the company for her own personal gain and revenge on Miorine's father. Thus, with her accidental victory, Suletta did not make adjustments to Prospera's plans, but only unconsciously carried them out even before her mother initiated her into it.
(Source: Official Site)