Mr. Red made his first appearance on a Reds uniform as a sleeve patch in 1955. The patch featured Mr. Red's head, clad in an old-fashioned white pillbox baseball cap with red stripes. The following season, 1956, saw the Reds adopt sleeveless jerseys, and Mr. Red was eliminated from the home uniform. He was moved to the left breast of the road uniform, and remained there for one season before being eliminated entirely.
In 1999, the Reds re-designed their uniform and "Mr. Red" was reintroduced as a sleeve patch on the undershirt.
A human version of the mascot had appeared by at least 1975, certainly by Game 5 of that year's World Series, when he appeared on screen during the NBC broadcast (see the DVD version available on A&E Video). The mascot disappeared in the late 1980s for unknown reasons. The costumed mascot was reintroduced in 1997.
Mr. Red was joined by Gapper, a new furry mascot created by David Raymond (the original Phillie Phanatic), as the franchise moved to Great American Ballpark in 2003. In 2007, the current Mr. Red has been supplemented by a retro 1950s version known as "Mr. Redlegs", complete with handlebar mustache and old fashioned baseball uniform. Throughout the 1970s and 1980s, Mr. Red wore uniform number 27.
The humanoid Mr. Red retired in 2007 leaving "Gapper" and a mascoted "Mr. Redlegs" to take his place. In August 2008, a female companion named "Rosie Red" named in honor of the group that supports the team, the Rosie Reds, was introduced. A new Mr. Red Mascot was unveiled at Redsfest for the 2012 season, the new mascot will be on the field with "Gapper" and "Rosie Red" and "Mr. Redlegs."