Breanna Diaz is the mother of Noah and Kris Diaz, serving as a supporting character in the 2023 film Transformers: Rise of the Beasts. She is a resident of Brooklyn, New York, and is depicted as a hard-working, single parent facing significant financial and familial pressures. While her son Noah is an adult trying to find his path, Breanna remains the anchor of the household, balancing the demands of her job with the responsibilities of caring for her younger son, Kris, who is battling sickle cell disease.

Her personality is defined by a practical, no-nonsense attitude, though this is tempered by a dry and loving sense of humor. She is deeply caring and protective of her children, but also realistic about the challenges they face. This is evident in the way she manages the household, ensuring that chores are done correctly, as seen when she re-irons Noah's shirt for an important job interview after finding him burning breakfast. Her conversation with Noah before he leaves for the interview reveals her protective instincts and her awareness of social dynamics. She advises him to handle any talk of hospital bills regarding Kris's treatment by stating they are "handling it," and wryly suggests he laugh at all of his interviewers' jokes because "white people love that shit". These moments highlight her combination of maternal care, streetwise sensibility, and a straightforward approach to survival.

Breanna's primary motivation is the well-being and stability of her family. She works to provide for her sons, particularly focusing on managing Kris's medical needs and the associated financial burdens. She is shown making sure Kris takes his medicine and coordinating his appointments, tasks that add to the household's daily stress. Her role in the story is that of the emotional and logistical foundation for Noah. The protagonist's journey to find work and help support the family is driven by his desire to alleviate the pressure on his mother. Her interactions are largely confined to the film's opening act, establishing the stakes for Noah by grounding the fantastical conflict in a relatable human struggle.

Regarding her relationships, the most significant is with her sons, Noah and Kris. The dynamic shows her as the authority figure who is simultaneously exhausted and loving. The father of the family is notably absent, and the film does not specify whether he is deceased or separated from the family, but Breanna is clearly the sole parental figure. Her relationship with Noah is central; she holds him accountable but also trusts him with the responsibility of taking his brother to the hospital. Her development is limited in the narrative, as she does not participate in the central adventure involving the Autobots and Maximals. Instead, her presence serves as the emotional anchor for Noah, representing what he is fighting to protect. She remains a constant, stable figure, and by the end of the film, the resolution of Noah's arc directly addresses his ability to finally help support her and his brother.

As a human character in a story about alien robots, Breanna Diaz has no special superhuman or combat abilities. Her notable traits are her resilience, her pragmatic wisdom, and her unwavering commitment to her family. She is characterized by her strength in the face of systemic and personal adversity, embodying the role of a mother working tirelessly to secure a future for her children.