Who's the 7th servant spot that I missed? And I was honestly considering just randomizing the servants to break people out of their comfort zones. Actually, I know how I'll do it. Unless the cast is going to blow a gasket over it, I've written down 7 lists of the servant classes in different orders. Please pick a class you want and a class that you don't want and a number between 1 and 7. The unwanted class on the list will be replaced with the wanted class.
So if you wanted assassin and not caster, it would looks like this....
1. Saber
2. Lancer
3. Caster -->Assassin
4. Rider
5. Assassin
6. Berserker
7. Archer
And you would get the class with the respective number or the invisible list. If the class was taken, you'd get the next number in order and 7 loops back to 1. I'll get whatever is leftover. This way there's a higher chance to get what you want and no chance to get the class that you absolutely don't want.
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Wasn't clear enough on the reservation list, I guess. Here is how it stands. 3 filled masters, 6 filled servants.
Reserved masters
Nevvy
Zlo
Phantom
Reserved servants
Nevvy
Zlo
Phantom
Akashi
Edge
Choi
Unless I missed someone.