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Character:

One of the Six God-Generals, Sync is a martial artist, as well as the strategist for the Six God-Generals' missions. Because he is the fifth replica of the original Ion, he initially wears a mask to conceal his identity. Sync feels he has no purpose for living because he was considered a failure as a replica of Ion and is only an empty vessel for Van's will, and blames the score for causing him to be "stuck with this pathetic life".

Source from Wikipeida