Mimi’s African American father who is a college professor and believes in persistence and kindness to enact change, supporting Mimi’s aspirations and challenges against gender norms.

Mimi’s Japanese mother who maintains her cultural traditions and eventually becomes more involved in the community while teaching Japanese customs.

Mimi’s best friend in Vermont, whose father is a college professor; she supports Mimi despite societal pressures and challenges gender norms alongside her.

Mr. Dell’s grandnephew who befriends Mimi, shares interests in non-traditional hobbies, and provides her with support and understanding.

The Olivers’s neighbor who initially shows distance toward the family due to his past experiences during World War II but eventually reconciles his feelings.

Mimi's supportive science teacher who encourages her dreams and helps further her interest in space exploration.

Mimi's relatives from her past in Berkeley, California, who impart their Japanese heritage and cultural practices onto her through fond memories and visits.