If you produce an animation project, then you will need at least one voice actor and you will know what to ask about your skills. This means that you have to go shopping for your voice actor – or plural actors, as the case may be – armed with a list of characters complemented with a brief description and a single sentence to the requirements of each character. Do not just hire a voice agent and hope you find what you can do what you need. Each voice actor is also different from each other, because each actor on the screen is different from his colleagues. After all, if the studio had cast Jack Nicholson as Vito Corleone, The Godfather would have been a different movie, even if Nicholson was Italian.
Put an original character, a complex character of apparent contradictions in his nature – the thug with a soft and sticky center, for example – or the archetype like Gandalf Ring Trilogy and Dumbledore in the Harry Potter series, you need to know what a Voice actor must be able to give life to this character. It is necessary to know which aspects of the voice are negotiable and which are not.
The age or accent of a character, for example, are generally not negotiable unless you are willing to change the heart of your production. If you need a French accent, but find a voice actor that does British accents, but is a genius to eliminate other challenging aspects of the character, which is perfectly fine to change the character to suit the actor. If “I have found a jewel that the actor has to make the call at the end, but at least you must know what you want at first, even if you find that you can do it.
They may even need special skills of a voice actor, such as being able to voice a child. Chances are you will not find a child who is a voice actor, after all. But there are things you can do to create the illusion. Bart Simpson, for example, is the voice of Nancy Cartwright.