In the Star Wars Archives book by Paul Duncan, there's a quote from Carrie Fisher where she talks about her view of Leia and how Leia has anger when dealing with situations. I believe Leia would have been more powerful than Luke Skywalker had she trained, but I don't think she would have been as calm and collected so easily. I think she would need to train with Yoda really hard before fully being able to control her anger and emotions. I feel the Skywalker bloodline in her would get out of hand and if she didn't have a hold on it, could lead her down a path Luke can't follow.
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