"rightful person" is correct and usable in written English.
It is used to describe someone who is legitimately entitled to something, or who has the appropriate authority to do something. For example, "John was the rightful person to make the decision, as he was the most senior in the team."
"I am a very rightful person," he declared.
During the call, he described McCann-Erickson as "now in the capable hands of the rightful person, John Dooner".
I really made an honest request to my God to show me the rightful person to do this business with.
This applies, even if he/she is labelled by school officials as a rightful person.
"Our focus now will be on working with Paul to identify the right person to work alongside him and to help us continue on our journey to return the club to its rightful place in the Premier League".
All of the rightful winners saw another person get their medals and heard another anthem played and saw another flag raised at the Olympics instead of their own.
There is still another reading that is more generous to the astonished responses: That these films prompt a rightful incredulity that a person could take footage of beheadings and massacres and use editing software to increase its dramatic effect.
A frequent grievance is that malevolent persons (often relatives) are defrauding the rightful heirs of the deceased person's estate.
The music of Front 242, the Revolting Cocks, Controlled Bleeding and Skinny Puppy pounds with venom, assuming its rightful place in white-person dance history as the chronological bridge between post-punk and techno.
According to Locke's famous account, persons acquire rightful ownership in external things that are originally given to us all by God as a common inheritance, independently of the state and prior to its involvement, insofar as we "mix our labor with them".
My family discriminated against me and denied me my rightful property rights.
