Greetings
Nimrothiel, so good to have another Warg enthusiast join us at the Appreciation Thread.
In answer to your questions about the Warg Rider, we here believe to have discovered new things about him only recently. (You can trawl through previous posts to see how we got there). So, here goes my attempt at a general summery.
Cam Beleg was the original and greatest Warg Rider, and the tale of his greatest exploits can be read in
Samwise's excellent post a little bit before this one. In after years, more and more beings (I believe they were all Orcs) were sometimes attributed the title of 'The Warg Rider' and, though they were all far less powerful than Cam Beleg himself, they yet kept alive the fear that Cam Beleg could instill in Middle-earth.
The
Two Towers movie has given rise to a popular misunderstanding of so-called Warg Riders. I'm sure you all remember Saruman's line in that film "
Send out your Warg Riders!" directed to what appeared to be a normal Orc. In the following battle which featured these 'Warg Riders' and the Rohirrim, it is easy for the audience to assume certain things about 'Warg Riders'.
This is a misconception. There are no such things as Warg Riders. Sure, there are riders who ride on Wargs, but that is altogether different. At any one time there is only
one Warg Rider.
And in answer to your other query, the Warg Rider is always, but always evil.