[quote=@PaulHaynek]
You know, if we add the irregular classes everybody would have a Servant.

Jus' sayin'.
[/quote]

The irregular classes aren't mechanically disallowed, you'd just need to make it a different Grail than the fuyuki one. If it's a fake war, it'll be a different system.

[quote=@TwilightDragon]
Dunno what those classes are, though. Not familiar with them. :/
[/quote]

Saver is like a messiah character. 

Avenger doesn't really work because of its mechanics. 

Shielder is the knight of the Shield. 

Ruler should probably be avoided.