WHAT VOICE I'M LOOKING FOR

Little Jimmy is of course, a ridiculous character who embodies a little boy. Meaning his performance should be somewhat exaggerated and have a "child" like sounding tone. He is very happy and optimistic for the most part, however, once he knows he's ticked off his father, his personality immediately shrinks to a more frightened, poor soul. To clarify, i am not looking for an actual child to voice this character. There is heavy material within the script. No NSFW material, however the script includes swearing and violence. It would be preferred for either a male to put on the voice of a kid, or a female actresses to put on the voice of a kid.