When Zois have children through Pregnancy, the offspring inherit a combination of physical features and personality predispositions from both parents. The genetics system in inZOI determines how a child Zoi looks and which personality tendencies they develop as they grow through the Life Stages.
Physical Feature Inheritance
Children born to two Zois inherit a mix of physical features from both parents. The Character Creation parameters of both parents influence the child's appearance:
Facial structure blends features from both parents
Skin tone is inherited from the parents' combined genetics
Hair color and texture draw from parental features
Eye color and shape reflect the parent combination
Body proportions are influenced by parental builds
The inheritance is not a simple 50/50 blend. The system introduces some randomization to produce children that resemble their parents while still being unique individuals. Players cannot directly control which features a child inherits.
Trait Inheritance
A child's Traits are not directly inherited from parents but are influenced by the family environment and upbringing. As children grow through the Adolescence and teenage stages, their personality develops based on:
Interactions with family members and their traits
The values emphasized in the household
Childhood experiences and skill development
The quality of parenting and household stability
Adopted Children
Children added through the Adoption system do not share genetic features with their adoptive parents. Adopted children arrive with their own pre-set physical features and develop personality traits based on their new family environment, similar to biological children.
Gender and Preferences
Gender identity and romantic preferences are set during Character Creation and are permanent once finalized. For children born in-game, these attributes are determined by the genetics system and the child's development path. Players can influence but not directly set these attributes for naturally born children.
Planned Genetics Improvements
The 2026 Roadmap includes several planned improvements to the genetics system:
Enhanced genetics system for more detailed physical feature inheritance
Twin and triplet pregnancy possibilities
More nuanced trait development based on family dynamics
Expanded body shape presets that affect inheritance possibilities
These improvements aim to make each generation of Zois feel more connected to their family lineage while maintaining the uniqueness that makes each new Zoi special.