I think that a good (if small) primer of how to play Rose without her memories would be to look at the few clues that we get from the flashback pages to Rose as a young girl - she was bright, happy, inquisitive, and seemed to think the best of everyone including her mother. She liked to play pretend quite often, signifying an active imagination that tended towards the more unusual even in typical child's play - rather than play princess or superheroes, for example, she pretended to be a therapist for her cat.
A lot of the cynicism that Rose displays now seems to have been self-imposed; during the exploration of her house she references actions taken by her mother that 'looking back on it now' seem to be cruelly mocking. This implies that at the time of them occurring she didn't even suspect that they were anything but genuine, suggesting that she was once a much more open and trusting girl. She's also much more comfortable with emoting. When Jaspers died she's quite visibly upset and requested of her mother a funeral for the cat.
Of course there are going to be things integral to her personality that don't change despite having no memory or previous context for them. Things like her extreme loyalty to friends (even if they aren't the same as in the game), intelligence, or tendency to look at things from all angles and maybe make a decision that could be seen as a little darker than morally gray. Without any previous experiences to sour her outlook I don't think that she'd have the same issues with authority or insecurities about being taken seriously that she does in canon.
However, this gets into your second point! I don't think that Rose would appreciate the actions of 'herself' that she sees through snapshot memories at all.
I actually had some fun once in a game where I played Rose very far back on the timeline and she received some shocking information about the future, but without enough context to accept it calmly. She recoiled in horror and became incredibly pissed - at herself for allowing the thing to happen in the first place. Another basic trait of Rose's, I think, is that she internalizes a lot of things that others would acknowledge as being out of their hands. She places a lot of responsibility unfairly onto her own shoulders and blames herself for when things go wrong.
Because your Rose isn't going to be given context for most of the memories she's receiving, it's going to be hard for her to reconcile the actions of the 'real' Rose with what she thinks she is now. If she has friends why does she want to incinerate herself so badly? Why did she let her mother die when she had the power to stop it? It just goes on and on.
I think that this sort of unpleasant memory theater would prompt Rose to decide that she refuses to take the path that's been seemingly set out for her and that she's going to change it to make it better. There's going to be a lot of inward reflection (am I really that mean to people? why can't I just talk about my feelings?) because the amnesiac Rose is going to feel a great deal of disconnect with the 'real' Rose. She's likely going to try and distance herself from the girl that she doesn't really feel is her at all and rationalize the less than savory points she sees.
So. Uh. I hope at least some of that made sense or helped.
Re: ROSE LALONDE
A lot of the cynicism that Rose displays now seems to have been self-imposed; during the exploration of her house she references actions taken by her mother that 'looking back on it now' seem to be cruelly mocking. This implies that at the time of them occurring she didn't even suspect that they were anything but genuine, suggesting that she was once a much more open and trusting girl. She's also much more comfortable with emoting. When Jaspers died she's quite visibly upset and requested of her mother a funeral for the cat.
Of course there are going to be things integral to her personality that don't change despite having no memory or previous context for them. Things like her extreme loyalty to friends (even if they aren't the same as in the game), intelligence, or tendency to look at things from all angles and maybe make a decision that could be seen as a little darker than morally gray. Without any previous experiences to sour her outlook I don't think that she'd have the same issues with authority or insecurities about being taken seriously that she does in canon.
However, this gets into your second point! I don't think that Rose would appreciate the actions of 'herself' that she sees through snapshot memories at all.
I actually had some fun once in a game where I played Rose very far back on the timeline and she received some shocking information about the future, but without enough context to accept it calmly. She recoiled in horror and became incredibly pissed - at herself for allowing the thing to happen in the first place. Another basic trait of Rose's, I think, is that she internalizes a lot of things that others would acknowledge as being out of their hands. She places a lot of responsibility unfairly onto her own shoulders and blames herself for when things go wrong.
Because your Rose isn't going to be given context for most of the memories she's receiving, it's going to be hard for her to reconcile the actions of the 'real' Rose with what she thinks she is now. If she has friends why does she want to incinerate herself so badly? Why did she let her mother die when she had the power to stop it? It just goes on and on.
I think that this sort of unpleasant memory theater would prompt Rose to decide that she refuses to take the path that's been seemingly set out for her and that she's going to change it to make it better. There's going to be a lot of inward reflection (am I really that mean to people? why can't I just talk about my feelings?) because the amnesiac Rose is going to feel a great deal of disconnect with the 'real' Rose. She's likely going to try and distance herself from the girl that she doesn't really feel is her at all and rationalize the less than savory points she sees.
So. Uh. I hope at least some of that made sense or helped.