Facial features, like eye color, eyebrow shape, mouth size, nose length, etc.
the way we talk, which words we use, the tone of our voice, accent
the way we see the world - our political, religious, philosophical points of view
the way we walk, poses we take, our body language
the way we look like, how we dress, which body type we have, color of our skin,
things we like and hate, like music, movies, food, other people,
the way we think, which language we speak, what subjects are easy or hard for us to understand
little imperfections of our bodies - scars, stitches, damaged body parts,