Being a Thomas Covenant website, the comparison is bound to come It also helps me to view the difference between the two when we see the comparisons. First, what seems to be the same:
-They were both alien to the world in which they reside
-They both hate whomever imprisoned them
-They both seem to rely on convoluted plans to achieve their desires.
Now, more importantly, the differences:
-Foul is obsessed with perfection, the Crippled God with imperfections (which could have to do with how they view themselves)
-The Crippled God seems to possess some power beyond those gained in manipulating others. Foul doesn't seem to possess this attribute.
-Foul seems determined to convince his opponents that moving against him is futile, that all actions against him would be turned against his opponents. The Crippled God doesn't seem to care. There seems to be a couple times
Spoiler
-Foul's purpose is very clear. I still don't know what the hell the Crippled God is shooting for.
In conclusion, both are nasty characters, but the Crippled God seems a bit more.... unsettling...