On the thumbnail, I thought I saw Kaga. Then when I clicked on it to see it clearly, it wasn't Kaga. Then I thought it was Hyuuga due to the hair and her facial expression. Then I saw the tags.

I definitely wouldn't mind Ayako being the vessel of an Archer-class Heroic Spirit, be it like Rin/Ishtar or Laetitia/Jeanne.

In fact, I'd gladly welcome it.