Just a story idea. If someone wants to use it, let me know.
Fate/Stay Night + Anime x-overs
The War of Kings
Set in Fate/Zero
It's the Fourth Holy Grail War, and every Servant is a King!
Saber, Archer, and Rider remain the same.
Caster, Lancer, Berserker, and Assassin must be Kings (or something similar/comparable)
Yugi Muto, Yu-Gi-Oh, Caster, King of Games
Monkey D. Luffy, One Piece, Berserker, King of Pirates
Naruto Uzumaki, Naruto, Assassin/Caster, Seventh Hokage
Natsu Dragneel, Fairy Tail, Caster/Berserker, King of Dragons (he beat Acnologia, the previous Dragon King)
Alucard, Hellsing Ultimate, Berserker/Caster, No-Life King
Rider's Feast of Kings should include all seven Kings
Hope someone finds this useful