Serina Sumi is a character from Blue Archive, known as one of the students of Trinity General School. She serves as a calm, caring, and highly competent nurse-like figure who often helps others with medical support and practical advice. In the story and related content, she plays a supportive role, tending to injuries and offering reassurance to her classmates and allies. Her gentle demeanor and reliable presence make her an important background and support character within the series.