Quote Originally Posted by Inego View Post
The most difficult is, of course, the setting and the plot. There's an idea to tell about a life of someone from his early childhood with his experiences (at this stage the simplicity of the language is very natural), and while he/she grows the experiences and the language "grow" with him/her. When the main character is big enough, the language becomes standard unabridged Russian.
If you want to follow the entire life of a person and keep it not boring it will be quite a hard task. Let's add some science fiction to speed up the process: for example make a protagonist not a human but an animal, a dog (for an example). Then let's subject the dog to a sort of special medical treatment, implant a human Pituitary gland to the dog (for an example). And assume that the dog will be gradually change his behavior from the dog's kind to the human kind. And therefore the language skills of the protagonist will grow gradually.