Oh, my...so many questions. I must apologise-it's as Link said. I've been trying to make sure Ganon won't return (though I seem to be failing miserably, otherwise we wouldn't be having legend of Zelda games, would we...?

)
Firstly, for Alantie's questions.
1. I had met Midna before meeting Link. In spite of her detached behaviour, I could sense in her the same desperation to save her kingdom as the one I felt. I'm aware that in letting her get close to Link, I was risking competition, but that wasn't really my worst concern. I was imprisoned, and she was free to come and go as she pleased, guiding Link through his adventure. I suppose if I hadn't felt any sympathy and likemindedness with her, I wouldn't have given her my life. That we were as one, I suppose, made me closer to Link and it made her soften up on him. It was a beneficial arrangement.
I do like Midna, no matter how she might be my 'rival'. I don't see it that way. I think we all developped strong friendship and respect over the course of that chapter in history. She is no rival: she is a friend.
2. I think helping Link fight Ganon was as exciting as the fight at the end of Wind Waker. Ultimately, though, it was Link who risked the most, defending me bodily and all that. I don't think I did much, but I spared Link having to shift gears all the time, so... I'm glad. I can't say having to fight Ganon was the most pleasant thing to do, though. It never is. He always finds a way to threaten me.
Did I mention I don't like Ganon?
3. As for Ganon possessing me... well, I was still within Midna at the time, so in a way, I wasn't in my own body to feel it. My body was soulless: alive but not really. It was only after Ganon vacated it that I could return to my own body.
I'll say, though, that knowing he used my body in my absence (how strange to say that!) is a little, well, icky. I've gotten used to it again, but being out of my body for months makes things awkward anyway.
I'm only sad that he used my body and spiritual strength to hurt Midna and seek to injure or kill Link. They haven't borne me any grudge, but I still apologized. Hopefully, it's the last time I'll ever have to vacate my body for long periods of time. It's just too much of a hassle.
Now...
What is a companion piece?
This might sound rather complicated; I wrote it for the Hylian Reviewer a month or two ago, when a question about companion pieces appeared...here goes...
"A companion piece can only be defined if we all agree on the following defining terms:
A story is a series of unchangeable events in a chronological order that start from point A and travels through point B, C, D, up to final point Z.
A tale is the story told through someone's, anyone's, point of view. As such, the story can be told in multiple ways, depending on whether it is first person, third person, and can alter the chronological order of things. So you could have the story be told from Z to A, or have H come in before E, and so on.
Note that it is impossible for a story to exist for posterity without being a tale. The moment you speak, write or record it, it has become biased by a point of view, which is what defines a tale in the first place.
So, a companion piece is a tale, as seen from a different person's point of view. Let me explain.
Often, the first person view blocks out many aspects to the story, and the ensuing tale may have blind spots which can cause confusion. A companion piece is therefore the same story, in the form of a different tale (through someone else's point of view). There is rarely a companion piece to a 3rd person narrative, because 3rd person narratives are mostly omniscient and do not need to be completed.
You can occasionally find companion pieces that merely situate the tale, in the form of maps, a history lesson, or some such piece that is detached from the original tale but still related to the story's setting. These are rare, though."
Co-written by Corinthia G. MaureleenAnd lastly-
-do Link and I have a song?
Hmm...Link is the musical one. He would know a lot better!