Warning: Long rambling to follow. Will take a while to get to the point and it may not be worth it. Don't say you weren't warned!
Anyway, I've been thinking about this a little further, trying to organise it into some semblance of order:
Firstly, every storytelling form assumes a narrative point of view, right? For example, 'Sandra felt a pang of concern for Will, whose loneliness made everything seem hopeless to him. Meanwhile, in Beijing, Su Lin enjoyed some truly delicious ice cream.' This is written in the third person from an Omniscient point of view: the unseen narrator knows what everyone is doing and feeling, wherever they are. We know that Sandra is concerned, Will is lonely, and Lin likes her ice cream.
'Sandra felt a pang of concern for Will, who seemed depressed. She pulled out her phone and called Su Lin, in Beijing. 'Hi, Lin, whatcha doing?' she said. 'Hi, Sandra. Not much, just having some ice cream.' This is also written in the third person, but from Sandra's point of view: we only see and know what Sandra knows. She can see that Will looks depressed and guesses, correctly, that he is, but he might have indigestion for all she knows. She can't know that Lin is eating ice cream in Beijing until Lin tells her, and she doesn't know whether it's delicious or kind of blegh. The narrative is limited and coloured by Sandra's perception.
'Will saw a pang of concern for him cross Sandra's face, but he could not bring himself to acknowledge it, overwhelmed as he was by the void of loneliness into which he had fallen, making everything seem pointless and grey. He wondered what Lin was doing in Beijing, perhaps enjoying some truly delicious ice cream?' Also third person, but this time from Will's point of view.
'I felt a pang of concern for Will. He seemed depressed, or maybe he just had a tummy ache. Anyway, I wanted to talk to Su Lin in Beijing, so I pulled out my phone and called her. 'Hi, Sandra!' she said. 'Hi, Lin, how are you?' 'Good, how are you? I was just enjoying some truly delicious ice cream.'' This is Sandra's point of view, but written in the first person, making it more personal, less distanced.
And then there's the second-person point of view. This is very rare, and with good reason, because the narrative voice tries to put the audience itself into the role of the main character, which is very difficult, if not impossible to pull off. No one likes being a puppet in someone else's puppet show. Leaving Sandra, Will, and Lin for a moment, this could be a story written in the second person:
'You pinch a baby to make it cry, then you cross the street to kick a puppy, and you poop in your pants.'
What? No! I wouldn't do anything like that!
'You argue with the text, protesting that you are not the kind of person who does things like that, even though you totally are.'
No I'm not.
'Well I'm writing this, so you are.'
What the hell do you know? Screw you.
Role-playing games get around this by sharing narrative duties between the DM and the player(s). The DM controls all external events, but the player identifies as the protagonist, controlling their actions, reactions, and feelings. Bad DMs often forget this and try to wrest control of their character away from the players.
'You can't bring yourself to sell the halfings as fertiliser.'
'Oh, yes I can.'
'No, you think about doing it, but your conscience won't let you.'
'Like hell it does.'
'You kind of like the stout and respectable little fellows, you begin to think that they're adorable.'
'No, no! They are vermin! Death to all!'
Or, 'You decide to sacrifice yourself for the good of all mankind, overcome by a sense of melancholy for all the friends you'll leave behind, all the fields you will never walk again, and yet with a satisfying sense of fulfillment and ultimate surrender to a destiny that...' 'Look, bad DM, if you want to end this with an unwinnable situation of 'rocks fall, everyone dies', that's one thing, but at least don't tell me that I'm supposed to like it!'
Getting back to Sandra, Will, and Lin: 'You are Sandra. Will seems depressed. Do you a) feel a pang of concern for him, b ) ask him what is wrong, or c) ignore him?' ('B)
Will says, 'The loneliness in my heart is a weight that crushes my soul with the banality of existence.' Do you a) comfort him, b ) ignore him, c) tell him to stop being such a drama queen.' ( C)
You may call Su Lin in Bei Jing now. Do you, yes or no?' 'YES.
'Hi Sandra,' says Lin. Do you, a) say 'Hi', b ) ask her if she has Prince Albert in a can, c) say, 'Hi, Lin. Are you by any chance enjoying some truly delicious ice cream?'
That's a second-person (you) point of view from the perspective of Sandra the character. What if we switch between all three?
'Will seems depressed. Do you, a) feel a pang of concern for him, or b ) not?' A.
Sandra looks concerned for you. Do you, a) say nothing, b ) say, 'My loneliness is a void, etc. etc', c) say, 'I ate a dead cat.' C.
Your phone rings. It's Sandra. Do you, a) refuse the call, b ) answer, 'Hi, Sandra.' ( B )
What do you say to Su Lin? a) 'Will ate a dead cat', or b ) 'Are you in Beijing, enjoying some truly delicious ice cream? B
How do you respond? a) 'Yes, it is truly delicious.', or b ) 'No, it's really crap ice cream that tastes like dead cat.'
I dunno, does that really work for anyone? None of them ever get to be 'your' character, they are just 'the' characters, aren't they? Although the story is fascinating, I wouldn't call it role-playing.