Conversation so far:
in what way was Lord Voldemort's character developed?
Rowling said Voldemort was invented as a nemesis for Harry Potter.
what was his character like?
he was a wizard ...
did he use magic?
CANNOTANSWER.

Question: did he ever cause any harm to Harry Potter?
Self-contained rewrite: Did Lord Voldemort's character ever cause any harm to Harry Potter?