Birth by Sleep Why does Mickey have a different Keyblade?

Yes, that is what i believe.I thin that this is why Xion has a kingdom key, because she has a duplicate of sora's memories in her and thats why she has a kingdom key.

 

From what I can tell, Mickey is apprenticed to Yen Sid, which is why he has the starry keyblade. He is presumed to be still studying to be the king, and has no or little rule.

 

Its clear that Mickey is holding the star seeker during the Battle with the knights so maybe Mickey left the keyblade with Yen sid when he took the throne. And when He left the throne to start his journey in Kingdom hearts he might have been unable to return to twilight town and insted went to see Ansem the wise but he ended up seeing Xeanort's heartless (You know that spirit seen on destiny islands near the start of Kingdom hearts) which cast him into the dark realm where he was trapped until the moment Sora used the Keyblade forged from the hearts of the Princess's of heart. That moment The keyblade Mickey wields in Kh2 was made by his memories of His rule.

 

Mickey is the King and is pretty well done with training. He was a former student of Yen Sid, just as at one time he worked for Pete on his steamboat. It's actually part of Disney history that was put into the game. Yen Sid was his mentor in Fantasia and there are old cartoons where Mickey worked for Pete and that's why we see it in Timeless River.

As for the Keyblades, they choose their owners based on who the person is and their alignment. Riku was the Keyblade owner until he decided to turn to Darkness rather than his friends because of his despair. His decision made the Keyblade choose Sora as the actual owner in Hollow Bastion. He was not 'evil' prior to that. He was trying to save Kairi and was still redeemable. He just ended up getting the short end of the stick when it came to where he ended up and he was also used. He was used by Xehanort's Heartless and so was Kairi, who was sent to find the Keyblade's intended bearer. So, no, Riku was not 'evil' but stuck in a very bad situation, having been taken advantage of because he was naive and desperate. He had his flaw and so did Sora. The Keyblade made its final decision when Riku cast his friend aside and chose Darkness instead out of mistrust.

King Mickey obtained his Darkside Kingdom Key from the realm of Darkness. It doesn't come out and say it so directly but in KH1, this is where it happens. He encounters Riku in Darkness because Riku ends up there after holding off Xehanort's Heartless from finishing off Kairi, Donald and Goofy after Sora sacrifices himself. Riku and Xehanort after this battled and Xehanort's Heartless sent Riku's spirit (Heart and Soul) to Darkness, but still had a link to him so he could control Riku's form without being inhibited any further. When Sora defeats Xehanort's Heartless, his Heartless goes and opens the Door to Darkness. Within you can see King Mickey pull out the Darkside Kingdom Key on a mount and he uses it to aid Sora in sealing the Door to Darkness. Xehanort rejoins with Riku, which is why Riku could not leave Darkness and would remain. Sora and King Mickey then seal the Door to Darkness because both the Kingdom Key and Darkside Kingdom Key were required to do so and the game ends.

As for why Xion has a Kingdom Key as well as Roxas, they are connected to Sora. Xion is also connected to Kairi, which I'm sure will be explained more in 358/2 Days.

 

I don't believe Xion is connected to Kairi, at least in the sense that she's Kairi's Nobody, because Namine is already known to be Kairi's Nobody. I believe Xion is connected to Aqua because Aqua has a currently unknown relationship with Ven. Ven looks exactly like Roxas. Roxas has a keyblade probably because Ven had one, as well as Sora. But Aqua also had a keyblade. Because Xion and Roxas both existed at the same time, and the current Keybalde bearer (Sora) is asleep, both of them wield the Keyblade at the same time. At least that is what I'm getting from what I've seen, because we have not yet seen Roxas and Xion with a Keyblade at the exact same moment in the exact same scene.

 

BBS may be before he becomes king. As for the other questions, there could be a number of plausible reasons for this, but honestly it may just be the fact he had used a different keychain at that certain period of time in the trailer, where he may have been getting ready for battle. Mickey may have used that keychain before the events of KH/KHII, while he still did have his keyblade, but chose not to use it in its normal form. Simple as that.