free spirit 
noun
An independent or uninhibited person.Independent and a true free spirit, it was clearly her transient, urban upbringing that gave her this hunger for success....
- I had eschewed the offer of a lift from my parents, wishing to appear independent and a free spirit.
- It is not a choice of free spirits vs. control freaks.
Synonyms
individualist, individual, nonconformist, unorthodox person, unconventional person, original, eccentric, bohemian, maverick, rare bird, rarity;
lone wolf, outsider;
Latin rara avis