I always think (briefly) of Will "Whoop-La" White as far as unknown pitchers. He lived in the shadow of his older brother, Deacon White, but has several interesting points of notoriety.
> He was the first, and for many years only, major league player to wear eye glasses while playing ball.
> His career ERA is 9th all time (say what?).
> In 1879, he started 75 games and completed all 75 of them with 680 IPs, and 2,906 batters faced, all of which are major league records which are unlikely to be broken, although the first could be if TB continues to use the same "opener" for a full season.
This guy is the opposite of the OPs fantasy pitcher with respect to intimidation. But he'd be on my "real" list of obscure pitchers who were actually better than people know.
https://en.wikipedia.org/wiki/Will_White
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HOF "Earliest" Collection (Ideal - Indiv): 250/346 (72.3%)
1914 T330-2 Piedmont Art Stamps......: 116/119 (97.5%)
1923 V100 Willard's Chocolate............: 180/180 (100%)