How should I make the character sound?

Many people starting out in voice acting ask casting directors," How should I make the character sound"?

Well to be honest unless they say specifically it's all up for interpretation. If you were going to audition for the role of Donald Duck, Disney would ask you specifically to Voice Double the existing sound of Donald. (Voice Doubling is an exact match to the original voicing.) But in most cases, companies want to see what creative qualities you can give a character and how you think they should sound. 

Sometimes after you landed a role, what you audition with isn't what the Director will use at all. In those cases the Director notices your acting abilities and other qualities of your voice, it's all part of the creative process. 

So, when you audition imagine in your mind what the character should sound like and let its personality shine through your interpretation.