I had a lot of fun with the other questions, but let's see if you can answer these correctly:

1.) "That's right! He used to give me that exact, same look!" – who is Xigbar referring to?
2.) What Keyblade does Ventus get after he faces Vanitas in Destiny Islands?
3.) Who announces Terra that Ventus has learned about his origins and now he's gone to force the truth out of Master Eraqus?
4.) How did Braig lose his right eye?
5.) How do you get The Ultimate Keyblade in BBS?
6.) Who asked Aqua for a date? (just had to ask XD)
7.) What ability does the Keyblade "Fenrir" attach?
8.) Who meets Sora after he quits The Accessory Shop in KH I?
9.) Who created Tron?
10.) "Ansem The …" – what was his full name?
11.) Who was Ansem's apprentice?
12.) (Okay now, the real question of ALL Kingdom Hearts) – Who is The Mysterious Figure?
13.) Which command of these two has 6 levels: "Ars Solum" or "Sonic Blade"?
14.) "Ultima Cannon" is …'s ultimate Shotlock.
15.) Aqua was demanded to keep an eye on …
16.) Down in The Dark Realm, Aqua holds her Wayfinder and says: "There's always…"
17.) Ventus decides to rest within …'s heart.
18.) Who is the most important composer for the Kingdom Hearts Soundtrack? (Japanese)
19.) Who met Aqua in The Dark Margin? (hint – he said it was his second time there.)
20.) Riku had to give in and take "Ansem's" form in order to defeat …
21.) They fought at … (the place)
22.) When did Riku eventually get rid of "Ansem's" form?
23.) Roxas has to defeat … in order to get "The Champion Belt".
24.) Who suggested Roxas to throw the mach for him?
25.) Terra gets the "Ends of The Earth" Keyblade after you finish… (the name of the world)
26.) "No bothering, ma'am!" – who was the party referring to?
27.) At the end of 3D, in Sora's story, Riku and Kairi turn into …
28.) Both Sora and Riku accepted to be tested for the Mark of Mastery Exam, but which one of them managed to pass it?
29.) In KH II, two characters can ride the skateboard. Which?
30.) Whose Nobodies stole the Cursed Medallions in Port Royal? (Sora had to defeat them in order to win back the medallions XD)
31.) Who commands the "Dancer" Nobodies?
32.) When did Axel really die? (KH COM or  KH II?)
33.) "In the end, every heart returns to … whence it came. You see, … is the heart's true essence!" – Ansem (better said, Xehanort's Heartless)  
34.) "Sanctuary" is the opening song for KH I & KH BBS or for KH II & KH 358/2 Days?  
35.) Who looked at Xion and realized she reminded him of a very dear friend?
36.) Isa is …'s Somebody.
37.) "As lightless oblivion devours you, drown in the everlasting darkness!" - …'s quote. (hint: KH COM, Sora's final battle)
38.) "I wanted to see Roxas." - …'s quote. (Come on, this is an easy one! XD)
39.) "A Sanctuary, yeah. Where fears and lies …" (just HAD to ask this, lol)
40.) In KH II, where does Sora fight Xemmy for the first time?
41.) Who is the Secret Boss in KH FM which you can fight at Hollow Bastion? (exactly where you fight Maleficient as The Dragon)
42.) In KH FM, what Keyblade does Sora get after defeating poor Sephiroth? (it looks way more nicer than Fenrir, but I doubt it's stronger…)
43.) Which Keyblade grants you the "MP Hastega" Ability in KH II?

As for usual, MAKE NO MISTAKE AND YOU GET A WATCH
MAKE LESS THAN FOUR MISTAKES AND YOU GET A COOKIE