There are many shows that, for whatever reason, recast some characters over time. However, the way character galleries currently function makes it so that only the picture set as main image shows up at the show cast and episode cast levels, regardless of who is playing the character at any given time.
If that can be done, a great way to prevent the picture of actor X to show up on an episode where the character is played by actor Y would be to have a drop-down menu to select which actor is shown at the "set as main image" level on the character gallery pages (something similar to the Poster/Banner thing on show gallery pages). It would prevent having different people's names associated with the same picture and reduce the risk of users creating separate entries for the same character solely based on recasts.



