Angelica and her brother Argalia are both Colour fixers, the Black Silence and Blue Reverberation respectively.
She and her unborn child perished before the game's events to The Pianist, kick-starting the game's entire plot. Her death caused Roland to inherit her title of the Black Silence and rampage through the city in a vain attempt to get revenge on the one responsible for her death while her brother Argalia was driven insane by her death and distorted.