who are you ?

No one. Perhaps a leaf caught in a breeze.

good answer.

i?

i am. i just am.

As it says

A mere atom, taking a break inside a body.

"Who" is in the question; not in the answer.

Thats probably all of us are searching for. To realise what we are, where we are from and why are we whatever we are.
These questions remain unanswered by all mortals and perhaps will remain so forever.