Even if you bred your pup, there is no way in the world you would be sure you would get another that even closely resembles him in either looks or personality! Remember there are many dogs in his lineage, and way back to the origins of the yorkie. All of these looks/mannerisms have a genetic availability to be reflected in your pups.
You need to really really study and research
whether or not you truly want to be a breeder. I am not one, nor do I have any inclination to be one at this time, and mostly due to some of the heartbreaks I have read here in these threads. You would learn much just by visiting the breeder site here, and reading for hours.
You would also need to have your dog medically tested and perhaps evaluated by a reputable breeder to see if he should be bred. I know you will be getting a LOT of responses here, (everyone who questions breeding usually does, lol) so please do your homework!
And after all that, if you still want to breed, hope you are successful in your quest. But unless you are CLONING, you have very little chance of your goal, in my opinion, and even then, personalities develop on their own and in different ways.
