One Borderlands 4 theory states that the new Siren is actually a girl named Emily Swan from Borderlands: The Pre-Sequel.
Source: N4G PC Is the Siren in Borderlands 4 Connected to the Pre-Sequel? The Emily Swan Siren Theory
One Borderlands 4 theory states that the new Siren is actually a girl named Emily Swan from Borderlands: The Pre-Sequel.
Source: N4G PC Is the Siren in Borderlands 4 Connected to the Pre-Sequel? The Emily Swan Siren Theory