Correction
First video
Second video
He is Harry Potter and he is Ron Weasley.
They are Harry and Ron.
They are on a train.
They are introducing themselves.
It is their first meeting.
They are Harry, Ron and Draco Malfoy.
He is mean. He is not nice.
His friends are Crabbe and Goyle.
They are on the stairs in the castle.
They are at Hogwarts.