Casey is an arrogant, but nice person. His arrogance is most likely brought about by his baseball prowess, and how he possibly believes star players are supposed to act.
Casey's story is based on an actual poem. It revolves around a baseball team from the town of Mudville and he is a baseball player. The story involves his victory and at one point he prevents people from killing the umpire.
In the sequel, his wife has children only for him to find out they are girls. Later he starts to bat for them.
Casey makes several cameo appearances in the series, one of which occurs in the episode "Ask Von Drake" during "The Ludwig Von Drake Song".
Casey's Corner is a baseball-themed restaurant located in Disneyland Paris' Disneyland Park, and in Walt Disney World's Magic Kingdom, which serves primarily hot dogs. Pictures of Casey and the pitcher from the Disney animated adaptation are hanging on the walls, and a life-size statue of a baseball player identified as "Casey" stands just outside. Additionally, the scoreboard shows that Mudville lost to the visitors by two runs, reflecting the outcome of the game in the poem.
There was a game called Casey at the Bat in the Games of the Boardwalk at Disney California Adventure. However, as of 2018, the game was rethemed as "Heimlich's Candy Corn Toss" as part of Paradise Pier being rethemed as Pixar Pier.