Isabella, whose full name is Isabella Yamamoto, is a supporting character in Paradise Kiss. She is introduced as a member of the independent fashion design studio known as Paradise Kiss, where she works as a patternmaker. She is a transgender woman, and her personal journey of self-acceptance is closely tied to her passion for fashion.

Coming from a wealthy family, Isabella’s relationship with her biological relatives is strained. Instead, she has been raised largely under the care of her devoted butler, Sebastian Ueda. As a child, she experienced distress due to the disconnect between her assigned male body and her female identity. A pivotal moment in her life came when she confided in her childhood friend, Joji Koizumi, also known as George. In response, George created and gifted her a dress, an act that allowed her to express her true self for the first time. This event became her new birthday, the day she began living as Isabella, and it inspired her to pursue a career in design and dressmaking.

Isabella is the calm and composed center of the often-chaotic Paradise Kiss group. She is characterized by her grace, patience, and nurturing personality, often acting as a mother figure or voice of reason for her friends. She is an exceptional cook and takes joy in preparing meals for the other members of the studio. Her gentle and understanding demeanor makes her a trusted confidante, particularly for the protagonist, Yukari Hayasaka, who often turns to Isabella for life advice and support during times of emotional distress.

Her physical appearance is notable for its elegance and height, making her the tallest member of the group. She has long, wavy purple hair, light grey eyes, and is often depicted with a flower painted near her left eye. Her fashion sense is aristocratic and feminine, reflecting her high-class background and personal identity.

Within the story, Isabella’s primary role is as a supportive figure. Her loyalty to George is absolute, as she credits him with giving her the courage to live authentically. She collects every piece of clothing he makes and remains a steadfast source of encouragement for his work. Despite her own unrequited romantic feelings for him, her devotion manifests as a quiet, unwavering presence in his life. Her key relationships are with George, whom she sees as her inspiration, and with Yukari, whom she mentors with kindness. She also has a close, familial bond with her butler, Ueda, who continues to serve her.

While she does not undergo a dramatic personal transformation over the course of the series, her development is revealed through her backstory. She demonstrates that she has already completed her own reinvention, achieving a stable sense of self. This allows her to focus on nurturing the growth of those around her. Her abilities lie in her technical skill as a patternmaker for the studio, her culinary talent, and her quiet emotional intelligence. She also has a hobby of collecting antique beads, a detail that becomes a subtle but meaningful contribution to the group's creative projects.