Is it possible for a Heir of Hope to have acted very much like a Rage player until the defining moments came? If not, how do you think a Heir of Hope would act like then?

Class and Aspect refer to the behavior that comes most comfortably to you, naturally, when you’re the happiest, and not being being held back or manipulated, or trying to be something you’re not. Complementary Aspects, also, are closely tied together. So if you see the ‘inheritance’ so to say to be the moment they free themselves from whatever was holding them back, then sure.