This is a tutorial of the steps to do a silicone mold of one figure, after having the mold you will be able to make all the copies that you want . The material I have used to do the copies in this case is polyurethane resin.
Step 1: Prepare the Figure.
First of all cut some pieces of wood to make a case for the figure.
Then glue the figure to the wood base and fill the holes of the base with some clay.
Step 2: Make Some Air Exits.
Depending of the shape of your figure you have to be sure that the air will have some exits.Wood sticks or pvc sticks are good for this purpose.
Step 3: Seal the Box and Add the Silicone.
Once your figure and the air exist are ready, you can close the box making sure that there is any holewhere the material can scape. You can use some clay to be sure, also hot glue.
Once you have the box, mix the silicone and pour the material.
Step 4: Let the Silicone Get Hard.
Once the silicone is hard, you can take out the woods and proceed to take out the figure.
Step 5: Take Out the Figure.
A good thing of silicone is that is flexible and you can cut it easy, take out your figure cutting ass less as possible.
Step 6: Remenber to Take Out the Wood Sticks.
Step 7: Seal the Mold With Some Staples.
Make sure that the cuts you have done are well situated, and put some staples to keep it together.
Step 8: Mix and Pour the Polyurethane Resin.
Step 9: Let the Material Get Hard.
Step 10: Take Out From the Mold Your Copy.
Carefully take out the new figure from the mold.