Estella is a seventeen-year-old girl of Hispanic American heritage who appears in the anime Under the Dog. She is a veteran member of a special team known as Flowers, having been recruited at the notably young age of eight, which makes her the most experienced operative among the group's members.

In terms of personality, Estella is often characterized by her sarcastic demeanor. Her experience and the harsh nature of her work have shaped her into a reliable and seasoned professional, but beneath this tough exterior, she possesses a warm heart and can surprise her teammates with unexpected acts of kindness and whimsy. She is deeply integrated into the team's dynamics, having grown up within the organization, and shares a particularly strong and frequent working bond with another operative named Sayuri, with whom she is often paired on missions.

Estella's primary role within the Flowers is that of a long-range combat specialist. She is highly skilled with a sniper rifle, a talent that makes her a crucial asset for the team's operations. Her abilities and tactical value stem directly from her extensive training and early start within the program, allowing her to function as a dependable and composed presence during dangerous assignments.