Ar, yes, Patch and Five are, in a way, unique races.
Patch (actually Five) is for Antifive, and Five (actually Patch) is for Clown and Death. The idea is that they are mistaken for one another, but in reality, they are different. This is also done to emphasize their uniqueness and to explain why Antifive can see their true status.

Regarding the hats. What faith is there when the apocalypse is upon us? Well, in general, yes, it's something like a belief... a fashion.

Yes, Death can be executed. + as an option, you can slightly weaken him and give him a 75% chance of surviving after an attack.

P.S. Top hats are the funniest to me too.