Board Thread:Questions and Answers/@comment-73.37.85.204-20150210020229/@comment-3250527-20150210022824

Alicization features Kirito as a main character, but Asuna is reduced to a secondary character for the first half, and becomes a main character again later into the arc. As for the others, it's quite spoilerish.

However, during that first half (I dunno whether to even call it "half" anymore, since Alicization is so goddamn HUGE), you don't see too much of Asuna, but she still gets a bit of screen time.