TV Special
Description
Yumiko Yasukawa functions as a secondary protagonist in the franchise, introduced in the manga's second part to replace Ream Stream and Buyoyon after *Monthly Shōnen World*'s suspension. Her role gradually surpassed Yoko Shiraki's importance as the story unfolded, though the manga's irregular schedule and cancellation obscured the precise reasons.

Her background differs across media. The manga presents her as a stranger from another school whom protagonist Bon Namihira rescues from a slasher incident during a mission. Bon's failure to use the memory-erasing "Forgetter" device leads Yumiko to uncover the Time Patrol's existence; she then leverages this secret, demanding membership and compelling Bon to sponsor her recruitment. The 1989 anime offers an alternate origin: she accidentally witnesses Bon in his Time Patrol uniform and Time Boat, inadvertently activating it and traveling through time, resulting in recruitment after meeting Ream Stream and Gayler. The 2024 anime establishes her as a student from another class in Bon's school, already friends with Yoko Shiraki before joining the Time Patrol.

Physically, she is consistently depicted as good-looking. Her design varies: the 1989 anime gave her a resemblance to Yoko Shiraki, while the 2024 anime blended her manga look with the 1989 version, featuring brown hair and amber eyes. Her Time Patrol uniform also changes between manga and anime adaptations.

Academically and physically capable, Yumiko is portrayed as a popular student known for excellence and a cheerful demeanor, contrasting with Bon's average nature. Her personality combines cleverness, strong will, bravery, and occasional bluntness or impudence towards senior agents like Bon or Gayler, often fueled by a strong sense of justice. This manifests in challenging authority to advocate for correct actions, like her stance on Louis Stream's treatment. The 2024 adaptation presented a more modest and ladylike version, though she retained her calmness under pressure and capacity for sternness. Like other agents, she bears the emotional burden of being unable to save those destined for historically significant deaths.

Her relationship with Bon evolves significantly. Their manga introduction involved distrust, shifting when Bon reversed time to resurrect her after she sacrificed herself for a rescue target. While she frequently admonishes Bon for carelessness and often saves him due to her competence, they develop a pattern of jointly violating Time Patrol regulations. The 2024 anime showed their dynamic growing closer and more cooperative, with Yumiko shifting from formally addressing him ("Namihira-san") to the familiar "Bon" or "Senpai," reflecting deepening trust. Bon regards her as an excellent agent; she sees him as reliable despite his clumsiness.

Interactions with others also shift. Yumiko and Yoko Shiraki never met directly in the manga, but the 2024 anime established them as pre-existing friends. Similarly, while Yumiko and Ream Stream had no direct manga contact, the anime adaptations and the film *Doraemon: Nobita and the Birth of Japan 2016* portrayed them as fellow agents working together. Her connection with Buyoyon followed this pattern, becoming partners only in anime adaptations. Classmates Tetsuo Shiraishi and Yanagisawa often react to her presence with fluster due to her popularity and appearance.

Her development sees her progress from trainee to full Time Patrol agent, confronting the harsh realities of historical tragedies and navigating strict rules against altering significant outcomes. This journey involves personal growth through challenging missions and evolving partnerships, culminating in her official promotion during the 2024 anime's second season episode "The Day Troy Fell."

A recurring element involves her experiencing actual death and subsequent resurrection during missions, mirroring Bon and Ream, typically occurring when substituting for a rescue target. This underscores the inherent risks of Time Patrol duties.

Trivia notes discrepancies in her birth year: 1966 in the manga (setting the first episode in 1979), 1975 in the 1989 anime (setting the first episode in 1988), and unspecified in the 2024 anime. She, along with Bon and Ream, made cameo appearances in *Doraemon: Nobita and the Birth of Japan 2016* and *Little Mystic Super-express*, though their identities weren't explicitly confirmed within those films.