Regarding aliens, since most of the discussion has already occurred, I have only one thing to add. Any alien species with the capability of travelling here, to Earth, would paradoxically have no reason to come here or make contact with humans, or any other species on Earth. We are not sufficiently advanced enough to be useful or to be a dire threat to them, and as for the resources of the planet and solar system, Sol would provide only a fraction of the amount of energy that can be obtained elsewhere.
Lightsaber form: Probably a combination of Makashi and Trākata. Aside from the stylistic appeal, I believe that to use a lightsaber in the most efficient manner, a practitioner must also discard all of their preconceptions of what a sword ought to be. Due to the nature of lightsabers, fluidity, precision, and the ability to deactivate the blade are essential in using the weapon to its fullest potential.
Superpower: The power of "cogito ergo sum". So long as I am aware of myself, I will continuously revert back to my default physical and mental state. Mind controlled? No problem, I can regain control of myself. An explosion? As long as it happens fast enough, I can reform my body before I truly "die".