Misaki Okusawa, a third-year student at Hanasakigawa Girls' High School, serves as both the DJ and composer for the band Hello, Happy World! while operating under the identity of the pink bear mascot, Michelle. Her path to the band began during a part-time job handing out balloons and flyers inside the bear costume, leading to recruitment by Kokoro Tsurumaki. Beyond the band, she holds the position of student council president and maintains a friendship with Rimi Ushigome.

She possesses pale grey-blue eyes and straight, shoulder-length black hair, typically secured by a pink hair clip. Her casual style features a grey "FUNNY" hoodie layered with a cropped blue jacket, black shorts, and a grey-and-black bear-motif cap. Winter attire includes a dark blue-violet beanie, blue striped sweater, knee-length skirt, and maroon tights. Summer outfits consist of a white T-shirt under a grey tank top paired with belted shorts.

As Michelle, she dons a fluffy pink bear costume complete with white facial details and paws, large shiny eyes, and a fixed cat-like smile. Accessorized with fuzzy purple headphones, the costume matches her bandmates' performance uniforms. To preserve the mascot illusion for Kokoro, Kaoru, and Hagumi—who remain unaware Michelle is Misaki—she fabricates elaborate backstories. These include Michelle originating from a magical world where friendship with a flower fairy turned her fur pink and her lack of fangs signifying she is a "very nice bear."

Personality-wise, Misaki anchors Hello, Happy World! as the pragmatic voice of reason, often bristling with sarcasm or exasperation towards her eccentric bandmates, whom she privately dubs "sanbaka" (The Three Idiots). Initially reluctant and preferring a quiet life, she joined the band to avoid trouble but gradually adapts to her role. Her frequent frustrations include failed attempts to convince the others she and Michelle are the same person—a truth only Kanon acknowledges. Despite outward reluctance, Misaki demonstrates diligence and responsibility, handling critical behind-the-scenes tasks: booking live shows, translating Kokoro's abstract humming into songs, interpreting Kaoru's poetic dialogue, and accommodating spontaneous requests. She consistently downplays these contributions as "nothing special."

Her development reveals a shift from annoyance and resignation towards a subtle sense of duty and affection for the band. Over time, she expresses her genuine thoughts more readily while continuing vital logistical and creative duties, composing music and using her sewing skills to maintain the Michelle costume. This evolution reflects her growing, unspoken commitment to the band's success.

Personally, Misaki has a younger brother and sister. Her hobbies include felting—a craft she taught to Kanon—and tennis, played since middle school. Performing in the heavy Michelle suit notably improved her physical strength, particularly for executing smashes. She enjoys family-style dishes, dislikes coriander, and frequently drinks coffee.

An additional facet shows her role in the "Girl's Blossom Project" spin-off, depicted as a dependable Tennis Club member at Garupa Private Academy. There, she partners with Himari in doubles matches, supporting her during play, reinforcing her characteristic reliability and calm demeanor.