Mrebo said:

I think RLM had a point that it should have been the story of Obi Wan Kenobi. In the OT, Obi Wan was there to pass the torch. It is more impactful if Obi Wan was the central heroic figure of the PT rather than the mentor of the hero

...

Alternatively, the central hero could be Luke's mother. Her character is a blank slate. She could be a strong character, urging Kenobi to take her son away where he would not be found. It is through her that Kenobi gains importance as caretaker. [Not sure how to deal with baby Leia yet].

Those are two very appealing constructs, Mrebo, especially the one with Madam Skywalker as the protagonist.

Currently I'm having Obi-Wan be a secondary character (at best) for Episodes I and II, mentoring the protagonist and warning Anakin not to let the hatred he feels for his mortal enemy take control of him. It is only after Anakin goes off the deep end (at the conclusion of Episode II) that Obi-Wan becomes the Gandalf tagging along with our traveling heroes. Before that point he was more analogous to Dumbledore...wise and powerful, but mostly off-screen and concerned with higher affairs at the Jedi Sanctum.

As for Mother Skywalker, here called Jeni, she's had a past relationship with the protagonist ("Ben") that went sour, and then takes an interest in Anakin. But after Anakin goes dark, Jeni acts as a foil to Ben; she knows that there is still good in Anakin, an echo of Luke's attitude towards Vader in ROTJ. It is by this time that Jeni is pregnant with the twins.