YOU SAID:

I think it was someone entirely new

INTO JAPANESE

まったく新しい人だと思います

BACK INTO ENGLISH

I think that he is a completely new person

INTO JAPANESE

彼は全く新しい人だと思います

BACK INTO ENGLISH

I think he is a completely new person

INTO JAPANESE

私は彼が全く新しい人だと思います

BACK INTO ENGLISH

I think he is a completely new person