A "new person" is someone who has recently joined a group, job, or community. It can also mean a person who has changed their habits or outlook and feels renewed.
Sometimes you have to kind of die inside in order to rise from your own ashes and believe in yourself and love yourself and become a new person. Gerard Way
Middle age is when you've met so many people that every new person you meet reminds you of someone else. Ogden Nash
I love my family and I miss them very much but I'm a new person now. I know a lot of people will not agree with what I've done, but it was right for me. LaToya Jackson
I was a new person then, I knew things I had not known before, I knew things that you can know only if you have been through what I had just been through. Jamaica Kincaid
Are you the new person drawn toward me? Walt Whitman
Try to find pleasure in the speed that you're not used to. Changing the way you do routine things allows a new person to grow inside of you. But when all is said and done, you're the one who must decide how you handle it. Paulo Coelho