Final answer:
Lady Macbeth is the character that matches the description through her involvement in the prophecies and the murder of Duncan.
Step-by-step explanation:
The character in Shakespeare's play Macbeth that fits the provided description is Lady Macbeth. This is evident from the excerpts given, where she talks about the prophecies of the witches, convincing Macbeth to murder Duncan, and dealing with the aftermath of the murder. She is a central character who drives the plot by manipulating Macbeth and orchestrating Duncan's murder to fulfill the prophetic titles given to Macbeth by the witches.