Like real-world, NPCs can be bred to create new offspring. To avoid hyperinflation of NPCs there is a maximum amount of times an NPC can be bred before it is sterile.
Breeding an NPC costs $MDEFI depending on how many times the NPC has been bred. The $MDEFI portion is variable and subject to adjustment based on a myriad of economic factors. NPCs cannot be bred with their children and NPCs cannot breed with their siblings.
$MDEFI Cost Per Parent
Each NPC has 9 body parts as well as a body shape.
The dominant gene is what determines the body part that is physically present on the NPC. When breeding, each gene has a chance to be passed down to offspring:
Dominant: 37.5% chance to pass this gene to offspring.
Recessive: 9.375% chance to pass this gene to offspring.
Co-dominant genes: 3.125% chance to pass this gene to offspring.