That would suck if Stiggy got unmasked. It's part of the fun of the show to have him depicted as some non-human being who does nothing but race... I would think aspies could relate to the Stig's odd, robotic existence. Giving him a human identity would certainly ruin that.
But yeah, they probably could get another Stig successor.
... The Red Stig? Blue Stig?...
The Gold Stig!...
Although it'd be weird to associate a new color with a new Stig.
I wouldn't want his identity revealed, but at the same time I don't know if I feel it appropriate for the BBC to try to censor someone else over this. I would hope the publisher/author would want to preserve discretion with this issue since he's such a popular figure and revealing his identity would certainly destroy the character.
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