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.
did he ever cause any harm to Harry Potter?
Harry has to find out, before we find out.
And--so--but for some mysterious reason the curse didn't work on Harry.
how did Rowling come up with the name Lord Voldemort?
Voldemort was invented as a nemesis for Harry Potter (the protagonist of the novels), and she intentionally did not flesh out Voldemort's backstory at first.
did she eventually flesh out his back story?
she intentionally did not flesh out Voldemort's backstory at first.

Question: did he have any followers?
Self-contained rewrite: Did Lord Voldemort's character in Harry Potter have any followers?