I think it's because she serves almost purely as a stand-in for the reader, so I get to feel even more absorbed into the story. Cara still feels a bit like a vanilla character, with no real depth besides the usual "bravery, loyalty, and love," but somehow that doesn't really bother me with these books. It's got danger, excitement, friendship, family, and (of course!) unicorns.
Of the three books that I've read, Song of the Wanderer is definitely my favorite. But did it really happen? Why, yes indeed. So we've got the room for fleshing things out. The final book in the series, titled The Last Hunt (which I haven't been able to get my hands on yet), takes the cake at just over 600 pages. Song of the Wanderer is the size of an average novel at 330 pages, and the third book, Dark Whispers, was a cool 480 pages. As you can see, this fear was laid to rest the minute I got my copies of the second and third books from the library. My biggest fear about the rest of the series? That they wouldn't be able to flesh the tale out as much as I anticipated was possible, because of their meager page counts. Nothing about it particularly wowed me, but I did enjoy reading it and I looked forward to reading the later books. It was a good book, but very short (not even hitting the 200-page mark). I reviewed the first book in the Unicorn Chronicles, Into the Land of the Unicorns, a few months ago. This review is also available on my blog, Read Till Dawn.