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I imagined Jasper as a heir to the Shitennou's memory, having supported them behind the scenes rather than getting directly involved. After their deaths, Jasper chose to flee the Dark Kingdom instead of opposing (or allying with) the Senshi. Following Serenity's victory and a near-death experience of his own, he is currently working to establish a legitimate lifestyle on Earth.
Jasper is diligent, determined, and obnoxiously resilient. He is also afraid of his own potential, worrying that fighting for a cause will leave him vulnerable to explotiation, and thus ultimately cause greater harm than good.