Silent Assassin. R

 I am a specialist in my chosen profession.

You see, you need to be clever, smart, and skilled. 

You need to be invisible, a ghost. 

Thanks to an ability I discovered at puberty, I was one of the best in the business.

I can possess other people's bodies for a short time.

I never learned to do it for more than a couple of hours.

As I never need that long to do my job.

I find a person whose Ora tells me I can take over them.

None of them ever remember me.

They think they have just blacked out.