Reds:
Wily Mo Pena (30) -I think of him a lot more fondly as an ex-Red than I did as a Red. The "Mo" is short for "Modesto" BTW...
Marty Brown (49) -3B who had three stints with the Reds in the late '80s without ever being able to get above the Mendoza line. Later played and managed in Japan; currently the manager of the Las Vegas 51s.
Don Nottebart - A Red in 66-67. Known for pitching the first no-hitter in Houston history, and for surrendering Willie Mays's 500th homer.
Others:
Charlie Spikes (61) - His real first name was Leslie; he went by Charlie or his ultracool nickname: "The Bogalusa Bomber".
Kurt Bevacqua (65) -Originally a Reds draft pick. Starred in a losing effort in the 1984 World Series for San Diego. Also the 1975 Topps bubble-blowing champion.
Joey Amalfitano (78) -Some names are just fun to say out loud and "Joey Amalfitano" is one of them. A Reds coach in '78, but best known for spending 16 years coaching third for the Dodgers.
Chico Carrasquel -A highly regarded shortstop back when they weren't expected to hit. Nellie Fox's double-play partner before Luis Aparicio, who was very similar to Carrasquel but better. The first Latin-American to start an All-Star game.
Sam Jethroe -"The Jet" played Negro League ball in Cincinnati before breaking into the majors in 1950 with the Braves. Led the league in steals his first two seasons, but faded quickly after that, possibly because he was four years older than his listed age- he was 32 as a rookie instead of 28.