Mixed race people also "pass" your "unique" points, as do non-white people adopted, for example, by white parents in a white-dominated society.

Point taken.

As for adult role models... I'm mulling over how to petition Sesame Street to hire disabled adult actors for their cast. They're great at showing kids with a wide variety of disabilities playing with able-bodied kids. But none of the current crop of adults are disabled (In the past, they'd had Linda Bove, who's Deaf, and a native signer; but she was more representative of cultural variety than disability).