Introduction

In the iconic Star Wars saga, God-like executed characters like Darth Vader undertake a series of complex and often tragic journeys. One compelling scenario is what Darth Vader would do if he knew that Princess Leia was his daughter before his appearance in A New Hope.

Strategy for Conquest

Given his mindset and past actions, it's plausible that Vader would have combined his affectionate manipulation and brooding determinedness. With Leia as his daughter, Vader would take a more benign, calculating approach. Here's how he might have pursued control over the Galaxy:

Contrary to his usual brutality, Vader might have decided to reveal the truth to Leia, initially. Growling out the words, 'Father,' might have softened her stance and laid the groundwork for using her as a royal leverage against Palpatine. The emotional bond could have served as both a facade and a genuine attempt to align forces against their common enemy, Emperor Palpatine.

Consolidating Power

Instead of torture, he would use this newfound sense of family to his advantage. Vader’s ultimate goal would be to create a unified front: Father and Daughter against the evil regime. By training Leia in the ways of the Force and equipping her with powerful knowledge, he would ensure a dual threat to the Emperor.

In the earlier days, Vader may have initiated a dual apprenticeship, where both Luke and Leia were groomed for different purposes but could potentially collaborate. The trust he built with Leia could make her his secret ally, even if she resists his commands. Slowly, through manipulation and incentives, he could turn her into a reliable partner in ushering in an era of his own leadership.

Historical Consequences

Had Vader known before the events of A New Hope, it might have altered the trajectory of the storyline:

Vader could have taken Leia with him and initiated rigorous tests, blending her with his training program. Their bond might have supplied additional motivation for Luke, and the two would have worked together toward overthrowing Palpatine. Leia would have become the strategic weapon Vader needed without the immediate threat of her betrayal.

During the events of Cloud City, a changed Vader would act differently. He might have prioritized taking both Luke and Leia with him, using them as dual threads to draw out and ultimately assassinate the Emperor. The presence of Leia could have added a humanitarian touch, generating support and loyalty from the population, enabling a greater reach of his efforts.

Conclusion

Considering Vader’s deep-seated hatred for Palpatine and his desire for power, the revelation of Leia’s identity would have complicated, if not altered his plans. The incorporation of Leia as a royal figure into his scheme would strengthen his position, not only in the Force but also in the political realm. The potential outcomes, while speculative, demonstrate how pivotal familial bonds can be in the Star Wars universe.