You can describe someone as a right-hander if they use their right hand rather than their left hand for activities such as writing and sports and for picking things up. left-hander
one who uses the right hand to write and to do most things; person who uses the right hand with more skill than the left; hit made with the right hand
{i} one who uses the right hand to write and to do most things; person who uses the right hand with more skill than the left; hit made with the right hand