Originally Posted by taosaur
He's not presented as admirable, though perhaps enviable in a Mary Sue-ish fashion; his interactions with women are very much adolescent wish-fulfillment, and of course he has lots of cool powers.
Pretty much this. I don't think Atticus is a clear example of an idolized Author Avatar, but at least at the beginning of the book he seemed a bit too perfect (though not necessarily likeable) and special. Pretty, intelligent/wise, literally capable of destroying his enemies (the Faeris right at the beginning) with a touch, mostly immortal, getting it on with the hot godesses......
The term is something I picked up on TvTropes
where it isn't only used to refer to Author Avatar Characters even though it's part of the definition there too.