important person
influential person
personage

His mother had made him the most important person in the family.

"She is the the second most important person in the country."

He looked at me as if I were the most important person in the world.

He was the most important person in the world to me at the time.

I was no longer the most important person in my life.

To him, the most important person in the world is himself.

I think he is the most important person we should now support.

None of the three women have met before but each one is sure she was the most important person in his life.

You're the most important person there will ever be in my life!

It was the first time she had ever felt like an important person.