My Grandson is 6 years old loves Pixar cartoons, loves to read he very excited, I think he's very animated and would make a very good cartoon character. Have Pixar considered Kids for young voices and what are the chances of being considered.

Would probably help if he took acting classes in school and found an agent if he gets into it

Get voice lessons and an agent. They must do caring calls as needed. I know sometimes specific websites are created for casting calls but I'm not sure how to get notifications for those.

I do not know, take a look in pixar website