Can players design their own appearance for the fifth ghostbuster?

Unfortunately, no. The character's design will be preset as a young, caucasian male (based on the look of Ryan French, Associate Producer of Ghostbusters the Video Game), and cannot be altered. There is no "create-a-Ghostbuster" mode. Because Sierra is no longer involved with the game, the player model may have to change. Ryan French is a producer at Sierra.