I honestly have no idea - sometimes, open-source artwork is utilized for mass avatar creation; vBulletin, phpBulletin, and other such forum softwares come with a large catalogue of default avatars that the administrators can choose to supplement or override altogether. I looked through the 18 pages of avatars we have available but did not find a matching image. That isn't to say that it wouldn't have existed at one point; rather, we've discarded the majority array of defaults in favor of game-related options.
If I had to take a stab at it, I'd say maybe one of the Imperial Knights from FFVI, like Biggs/Wedge perhaps. I honestly don't think it's from Final Fantasy, though!
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