Bianca is Finn's younger sister and the overcharging protagonist in The LEGO Movie 2: The Second Part. She is played by Brooklynn Prince.
She appears in quite a few scenes, kidnapping the heroes and taking them up to her room. It is also revealed the peace offering made by Emmet was her brother Finn's gift to her as a young child. When she was young, Finn had given her a heart which as Queen Watevra Wa'Nabi Bianca then created the Systar System.