User blog comment:B214/DxD Queen tournament/@comment-13032946-20150209034619/@comment-93.105.240.132-20150211202110

No while it may seem that way there is a difference between a main and major character.

Main characters have a static relevance in the story, while a major characters relevance curves between "useless" and "most relevant apart from the protagonist."

Major characters usually get story arcs which make them the "viewpoint".

So for example Rossweisse was the "viewpoint" in vol. 17.