Board Thread:Questions and Answers/@comment-39492511-20190518190801/@comment-29759785-20190518192128

As for Moon Cradle:

vol 19, Ronye is main character, Kirito is deuteragonist.

vol 20, Ronye and Asuna are main characters, Tiese is deuteragonist

As for Unital Ring:

vol 21, Kirito is main character, no deuteragonist so far