She has blonde hair that is tied up in a braided bun with side locks that curl at the end. Her eyes are dark gold and her face is usually expressionless. She is seen wearing a classic office uniform. Regulatory T Cell manifests an emotionless and professional demeanor. She only speaks her opinions when necessary; however, she can be a little clumsy and make major mistakes, such as mistaking a cancer cell as an ally cell because it originated from this body.