*Spoilers* Questions i would like to have answered about the story

I would like to understand some stuff that happened in the game.
or stuff that i question myself.

1 - How did the original members of Organization XII turn into heartless???
2 - Why would Sora save Namine Roxas Axel Xion from the realm of darkness, aren't they in their "Owners" heart?
3 - If all (Terra, Ventus, Aqua, Ansem, Xion, Namine, Axel and Roxas) are in the realm then why are they in all different looking locations?
4 - Why is Terra-Xehanort heartless and nobody try finding kingdom hearts for different reasons? How could they think of doing that when they "dont?" have memories? Why is the heartless not like a normal one who can't think? Do they both even have memories?
5 - Why didn't the members of O XII forget their memories at Castle Oblivion?
6 - How did Riku and Mickey leave the realm of darkness if the others can't?
7 - What did Ansem mean when he said in the secret ending of BBS "This is my 2nd time on these shores"
8 - Who is the one who tells Roxas at the beginning of KH2 (Maybe) that "I've been to see him, he looks alot like you".
9 - soooo if you kill the heartless and the nobody of somebody will he just return or what? (like Axel "Lea" and Xehanort)
10 - how did Lea became able to wield a Keyblade?
11 - Where/how are the unversed created
12 - is Vanitas goon for good?
13 - What is actually the thing creature behind Xehanort heartless (Fake Ansem)
14 - Wtf is a Dark Side
15 - Why doesn't Xemnas use a keyblade
16 - in 3D Xehanort brings 13 copies of himself but are these copies also Terra-Xehanort if not what happend to Terra-Xehanort?

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My thoughts and my curiosity.

1 - I know it was due to the Heartless experimenting of Xehanort then Ansem found out why but how did they turn?
2 - Xion returned to Roxas and Roxas returned to Sora and Namine to Kairi so why are they in the realm?
3 - In the SEnding of BBS. Xion Rox Axel were in on the station, Namine is in her room in the mansion, Ansem is with Aqua on the "Shore", Ven and Terra are in LoDeparture.
4 - ................. same as the questions
5 - Didn't Master Eraqus say that their "Trick" would send people to oblivion
what is oblivion anyway?(May seem stupid but still)
6 - i know Riku is returned to RoLight by "DiZ" but how did Mickey return and how did Ansem (DiZ) even return Riku.
7 - i know he meant he went here before but how and when
8 - they say it is Xemnas but isn't that place the same place of Ansem and Aqua?in the realm of darkness?
9 - i do not quite understand this
10 - Could it possibly be because he touched Ven's Wooden Keyblade (Does that even count as a keyblade) like Kairi did to Aqua?
11 - i know they come from Vanitas "Negativity thing" but still don't quite understand it
12 - he is destroyed right?
13 - he is ugly but what is he
14 - is he just heartless? nothing special?
15 - his original self can why can't he?why use Roxas when you can use urself (unless he is lazy which i doubt)
16 - nothing to say

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Note : Some of these questions might be answered but i didn't play or watch 358/2 days or 3D or Coded but i do not mind spoilers because im gonna watch them anyway

 

YES!! thank you i'll be waiting.

I do not want to nug about it but can any of you guys answer please?

 

thanks for the help but ehm i have this question

2 - why are they suffering?

and by the way the 2nd part is not questions really it is just how i think or feel about the questions that were said above