I'm actually interested on what would happen in FE8's story if Eirika isn't actually a kindhearted and naive person after all and is just a coldhearted sociopath.
Basically, what I'm trying to say is that what if Eirika is the kind of person who:
is smart and manipulates others by using methods such as pretending to be kind and naive.
never actually cares about anybody and only sees others as tools.
would leave someone to die just to save herself.
never really cares if somebody died whether its an ally or not and would sometimes insult them for being "weak".
I could add some more, but you get the idea.
How would this kind of Eirika react to the events of Sacred Stones or what events would change as a result of her personality?