IN: Which person is they?
Naruto has about 200 more episodes then Code Geass because they finished the story in much fewer episodes.
OUT: Code Geass

IN: Which person is he?
The professor grading the student's paper said that he was stupid.
OUT: the student

IN: Which person is he?
John disliked Bill and he did not pick him.
OUT: John

IN: Which person is they?
The X-Factor is starting to overtake American Idol in the ratings race since they have the popular Simon Cowell as the judge.
OUT:
The X-Factor