My star so far in my fictional history re-take is Charlie Geggus.
In real life he only played one season of major league baseball for the the 1884 Washington Nationals of the Union Association, his stats were: 10-9 record from 23 games, 177.1 innings pitched, a 2.554 ERA, 1.02 WHIP, and a 7.9 K/9.
This is what he did in the my league:
He won 2 Pitcher of the Year awards in the "minor" league and 5 in the "major" league along with 7 Championships (1891, 1895, 1896, 1899, 1902, 1903 & 1904). He has the most wins ever and should have more if not for major injury in 1896-1897 and in his final season of 1904.
He also played 5 seasons of "minor" league ball, and with those wins he has 409 professional wins in baseball. His "minor" league stats are below: