Esmeralda Koj is an actress based in Portugal. Developing a passion for performance at a young age, she trained in theatre at EVOÉ Professional Theatre School, where she appeared in productions including The Witches, directed by Carolina Parreira. She later expanded her training for screen acting through the Acting for Film program at Let It Happen Acting School (2024–2025), alongside masterclasses with industry professionals such as Pedro Carvalho and Custódia Gallego. Her experience also includes original theatre productions and assistant directing work, strengthening both her performance and creative skills. Fluent in Portuguese and able to perform with a General American accent, Koj combines acting with skills in contemporary dance, singing, voice-over, and improvisation as she continues to build her career across film, television, and theatre.