Reds:

Mack Jones -Played for the Reds in 1968, in between longer stints with the Braves and Expos.

Others:

Ricky Romero (27) Romantically linked with the 2010 Miss USA, which can't be a bad thing...

John Candelaria (58) -Goofy-looking but seriously effective Pirate pitcher. In his best year he went 20-5 with a 2.34 ERA and still finished only fifth in Cy Young voting.

Walter Johnson -A sidearmer like Candelaria (albeit a righty), his accomplishments are, of course, too many to list here. According to Wikipedia, Johnson and Ty Cobb faced each other more than any pitcher-batter combo in major league history.