The great Ken-Oh is summoned into the Holy Grail War. Fate characters get their feats from the original VNs and the three animes that follow each of the storylines therein, but feel free to answer based on including other references if you like.

1. What's an archetype he might fit into/master who might actually get him?
2. If he replaces that spirit, how does the grail war go with him there? How does he get along with his summoner and deal with the other characters and challenges?
3. How does this change depending on whether it's before/after he picked up Musou Tensei?

Personally I want to see him summoned as Rider because that's an experience Shinji deserves