AStoryForOne
this is a random idea; but why doesn't it meet the saint graph of Artoria Pendragon(Lily/Archer/Lancer(Goddess)/Ruler(Bunny)/Caster); and recruit the 2 versions as Artoria Alter(Saber/Lancer/Rider{Santa/Maid}) and MHX{Alter/XX}(Assasin/Berserker/Foreigner), with that they will have their respective NP available to leave the DXD universe more baffled