I think it’s exeptionally valuable for children to grow up with the opportunity to see admirable individuals from diverse backgrounds. Whether a child grows up only seeing admirable people who look different from himself or herself or grows up only seeing admirable people who look the same as himself or herself, his or her image of what it means to be a good person will be limited.
Also, I would like to add that I think it’s valuable to see diverse individuals model a diverse set of virtues. For instance, it’s good to grow up observing people of different genders and races demonstrating tenderness. The same applies to strength and intelligence.