I'd like to know your opinion on what is the best way to deal with, and eventually pickup a passive girl...
I'm not sure what's the technical word for this kind of girls but it's the kind who's really attractive but has barely dated guys in their life for some, really unclear to me, reason. (and no i'm not talking about lesbians)
Anyone getting the picture here?

Where are all the experts?!

I'm no expert by a long shot but ill give you my opinion

Passive girls are just like any girls, they want love and sex too. They might not be as experienced sexually or emotionally but they are always ready and open to a MAN to come and lead them through what they are unsure about.

This is a really vague question because your basically asking how to pick up ANY girl. If you know how to pick up a girl then picking up a passive girl would be no problem.
Treat her in the same way you would treat any girl, lead her. Lead the conversation, lead the interaction, other then that I don't know what to say without going into a whole life changing speech about self improvement and pickup techniques.

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I'm by no means a reliable source of information... yet

I appreciate your opinion man first of all, and no i know the techniques! Worked on my inner and outer game and all that a while ago (and still working to improve) but what i've noticed, to try and make it more clear, is that this kind of girls are less responsive to game you know? They're less responsive to anything in general. It's like they're afraid of letting go or just not programmed to carry on with the spark you create when you first meet and number close. They could be so into you, giving you IOI's without feeling it but they won't dare believe it. That's why i thought it's kind of a tougher game, or maybe just different, or if there were anything specific in her that you need to trigger for such cases?
That i would like to know.

a kind of girl like that sounds very emotionally broken. I'd say that she's the one that needs to do some self seeking. She might have some deep rooted issues that she needs to work out.
Sounds like someone that would have trouble talking or connecting with anyone in general, might be a lost cause. Find a more stable girl. There's plenty of fish in the sea

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I'm by no means a reliable source of information... yet

I agree she does.
She wouldn't have trouble talking, but connecting... that's where that kind of girls fail and i was wondering how to be one step ahead and overcome that. Thanks anyway, i'll post if i found a technique/solution. And yeah plenty of fish haha.