I am not aware of any Lydia in Harry Potter - nor of anybody with a similar name. The closest is perhaps Lily - Harry's mother.
There is no character named 'Milford' in Harry Potter.
Harry Potter!
There is no character of that name in Harry Potter.
No. Harry Potter is a fictional character.
There is no such character in Harry Potter.
There is no character by that Name in Harry Potter.
Harry Potter
In literature, a protagonist is the main character. Harry Potter is the main and prominent character in the Harry Potter Series, so that makes him the protagonist.
Harry Potter IS the character in this case.
Harry Potter is a fictional character.
There is no such character in Harry Potter.
harry