User blog comment:B214/Question and Answers 6/@comment-2601:87:8300:20D0:694A:7469:AEC7:1201-20190528140156/@comment-83.49.75.83-20190529214203

You should wait until Shin dxd 4(vali vs wukong) to confirm that..

There are 6 different pieces.. King, Queen, knight, Bishop, Rook and Pawns.

Maybe there is another character related with the journey to the west story in his team, or maybe they are only 5 because they are too powerful.