I think what makes people unique is a complicated matter. The first things is they have emotions and ways to express their emotions separately. The Second thing is we all are playing the long but short game of life, and we are all at a different point in life from toddler to elderly everyday is another chapter. This can be expressed as when people are young they will be fast and aggressive to do things they want to do, but as people grow older they become wiser and start to think before they act. There is obviously exceptions to this rule, but for the most part people are a lot more alike than we think.

The biggest thing that makes people unique is their personalities, because you have your introverts and extraverts. Everyone personality is different in a way that is unique to them.