Raiha Uesugi is a cheerful, kind, and unusually mature girl who often takes on the role of managing the household despite her young age, handling tasks like cooking and keeping track of finances. She cares deeply for her older brother, Fuutarou, offering him steady support while also calling him out when he steps out of line. Wise beyond her years and naturally thoughtful, Raiha’s sweet and charming personality easily endears her to everyone around her.

Raiha is skilled in cooking and regularly prepares meals for her family, demonstrating both competence and responsibility at a young age. It is revealed in Chapter 23 that she has a rather weak constitution, yet she continues to handle household duties with determination.

She is also shown to possess sharp wisdom and perceptive insight. Raiha understands her family’s situation well and often uses that awareness to help guide decisions or support her brother. Her shrewdness is subtly highlighted in moments where she uses her expressions or natural cuteness to persuade others, achieving her goals with quiet charm. She even manages to charm Itsuki Nakano and can easily distinguish the Nakano Quintuplets from one another, something Futaro himself struggles to do.