Trish O'Day is a character in the 2000 action film "Romeo Must Die," portrayed by Aaliyah in her film debut. She is the daughter of Isaak O'Day, a black real estate developer and gang leader in Oakland, California. Trish finds herself caught in the middle of a conflict between her father's gang and a rival Chinese Triad. She becomes an important ally to Han Sing, played by Jet Li, as he investigates his brother's murder and uncovers the truth behind the gang violence. Trish is portrayed as a strong and independent woman who doesn't shy away from getting involved in dangerous situations. She is resourceful and quick-thinking, often helping Han Sing navigate through various challenges. Trish shows loyalty to her friends and family, standing by Han Sing and supporting him in his quest for justice. Despite not being a trained fighter, she faces danger head-on and even participates in the action sequences. Trish O'Day's character adds depth and emotional resonance to the film, making her an integral part of the story.