Mechanimorphosis

Mechanimorphosis is the process used to create robo doubutsus. It usually consists of five stages:

First Stage
The first stage of mechanimorphosis is not very significant in the process. An animal is magically infused with human DNA and then put into a test tube. This is where the growth process begins.

Second Stage
The second stage of mechanimorphosis is the stage where the human DNA takes effect. The animal has morphed into a human baby. Depending on what kind of animal was used, the baby could have a variety of animal parts (ears, tail, wings, etc.). At this point, the doubutsu is taken out of the test tube to learn how to walk and talk.

Third Stage
The third stage of mechanimorphosis is the stage where the doubutsu has started to grow. The baby now has the appearance of a five-year-old child. At this point, the doubutsu is taken out again to learn how to read and write.

Fourth Stage
The fourth stage of mechanimorphosis is the stage where the doubutsu gets their first robotic attribute. The child is now a teenager and has started to be mechanified. The doubutsu now has a brain of half hardware, and is taken out of the test tube again to learn how to drive.

Fifth Stage
The fifth stage of mechanimorphosis is the final stage. The doubutsu is now a full grown adult. Their skeleton is replaced with a robotic, metal one, and they are taken out of the test tube for the final time. After two weeks, their form has set, and the will cease growing and remain adults.

Trivia

 * The stages of mechanimorphosis were inspired by the aging ceremonies from Lois Lowery's famous book, The Giver.
 * Mechanimorphosis is a magical process, not a scientific one. Without magic, making robo doubutsus would be impossible.