Bianca:

She is Cassio's jealous lover.

Bianca's name (meaning "white" in Italia).

She is in love with Cassio, but he does not return this love and treats her like garbage

Bianca suddenly enters, and her suspicions of Cassio are even greater than before. She is convinced that the handkerchief belongs to another woman, and throws it contemptuously at Cassio's feet. In Othello's eyes, her apparent jealousy confirms his wife's infidelity. This "evidence" all but completes Iago's manufactured case against Desdemona, and thereafter Othello is determined to murder both her and Cassio.