Well to me the conditions for you to not die but lose control of your character are as follows
1) You become a being beyond that which can be handled by the gameplay such as ascending
2) You become essentially unplayable liked turned into a pile of sludge
3) Your personally is wiped, gone, or irrecoverably different. (A spell turns you evil)
4) You lack at least subhuman intelligence. (Turned into a frog without retaining knowledge)
5) You lack the ability to think coherantly (being driven totally insane)
6) Control of your character is taken from you (possession)
Basically any point where a character is unplayable or a different character divorsed from the original.
Now of these the only ones that apply are 3 and 4 and since the fourth apperantly doesn't apply (Odd, but hopefully toady does something with it since they seem to act rather mindlessly) we only deal with the third.
Does a person possess enough of their original self to be considered the same person?
Now if you are wondering why I even made this suggestion when "being a husk is fun" it is because while a husk may be fun, and for all I know it is a fantastical ride of eternal joy, it doesn't make thematic sense for you to retain control of a character who is essentially by all means lost or unplayable.