By Sarah Jean Callahan Disney could have a change coming for its beloved characters, which might not be a bad thing. Walt Disney Co. will celebrate its 100th anniversary this year, which will likely feature the company’s best-know character, Mickey Mouse, in many different ways. The company’s cartoon characters are as old as Disney (DIS) – Get Free Report itself, although before Mickey came around, there was a cat named Julius and Oswald the Lucky Rabbit. But Mickey Mouse would soon rule the company’s kingdom after his debut in “Steamboat Willie” in 1928. He has been so popular that people hav…