One who goes with the flow of life. This type of individual is usually fully comfortable with themselves. They accept everything for what they are and go on with their day. Usually very positive. Free spirited people do whatever makes them happy, are content, & keep their cool better than most. Most of these people see things differently.
Someone: Never thought of it that way, he's a bit different.
Another: He is different, not weird but interesting. He's free spirited.