Have you ever wondered why some companies spend millions and millions a year on there characters ? simply because they are the best repsentives, they will ever have. your character will always be there for you day or night and will never ask for something or have sickness days.
designing a character is not easy, it has to be something people can communicate with, and understand, there for the character gives entertainment to all the family and tracks children the most.
not just that, creating the character is only one step to a huge job, after the design you must bring it to life by giving it movement and sometime even sound. but even so it is such a huge responsibility still character design can be so useful in many industry fields and can attract costumers directly to your business.