Could also just be that Bran is the only living being without earthly desires. He doesn't desire empire or fealty, riches or love, he wants nothing because that part of him has been stripped away. He is just knowledge and history, all seeing and all knowing, but without the ego or desire.
If one of the major points of the series is that power corrupts, then Bran is the only incorruptible being. He can't be corrupted because he can't want anything. It's a fairly simplistic way to look at Bran as King, but it does fit with what we've seen so far.
If one of the major points of the series is that power corrupts, then Bran is the only incorruptible being. He can't be corrupted because he can't want anything. It's a fairly simplistic way to look at Bran as King, but it does fit with what we've seen so far.