Talk:Brynhildr/@comment-190.235.171.66-20160207035910/@comment-1.52.157.176-20160207070342

He's a Counter Guardian and nameless Heroic Spirit that can be summoned to any point of time to erase any threat to humanity, similar to what players and Chaldea do in FGO story

So it's possible that he met every heroes, whether the others know him or not is another thing