Everyone got to pick their own.
Michael is Bumblebee because he is loyal and the guardian of our family, plus he's a technical genius.
I am Alice because I'm a dreamer and live in Wonderland and despite my current crimson hair color, I'm actually a natural blonde.
Nathan is Ben 10 because what boy wouldn't want to turn into an alien at will and save the world on a daily basis?
Benjamin is Luke Skywalker because he's the one with the fiercest determination and would easily make it through Jedi training. And the Force is definitely with him.