1. TP is more fleshed out. It's to be expected.
So what's your point? Wind Waker had the same deal but with a graphical difference and a kid-like appeal.
2. He is the same in every game. Every Link is a resurrection of the original Link.
Same by that aspect, but they are not entirely the same nevertheless. Besides, there is no offical time line to say that all these Links originated from this guy because really, we don't really know which one of these Links started all (Maybe the MC, but that's not entirely proven).
3. Fawful had a much bigger fanbase than Midna, but now? No one is even expecting a trophy of him anymore.
That was Fawful, a side villain then minor supporter on a handheld game that recently appear in it at least TWO years ago, while Midna has just passed one year on a successful console that appear about a year ago as well. Besides, Brawl wasn't even announced around that time for the Wii, so of course there was a chance for that one to happen, especially on handhelds.
4. Okay...? That'd be evidence that Link or Zelda could borrow something from Midna, not that Midna could get in as a character.
And you're bring in a comparison of a silly detective story with the Zelda series, rambling that Link and only Link is the star of most Zelda games? I'll take note of that. That not what I'm trying to say, besides she not even at a high possibility of being cloned or have a move for Link and/or Zelda. What I was saying though that unless most of the main character are different, they can implement the idea of having one of their moves, which shows that they were still important. Maybe not important enough but important nevertheless.. Fortunately enough, they didn't do anything to hurt Midna's chances of adding a move to an existing moveset of Zelda or Link.
5. If. You're making the argument as if Claus and Geno ARE in.
Yeah, I said IF, not like I'm going around stating "facts" that I gained from two games that are going to be different with another one. Maybe not Claus, but most likely Geno is going to get in the roster. There is a lot going for him and I wouldn't be surprised if he was made playable, in which it would open up other character appearances.
6. It doesn't matter what Sheik is now. She was included for a reason that Midna will not get in for. And by the way - usually, the star of the game is the most prominent figure. Not "less prominent than one other character by an extremely large margin".
Dude, of course we know Link has been in nearly all Zelda games and starred in them as well, so that is an obvious advantage against EVERY Zelda character up to date. However, Sakurai is not looking at just Link in Zelda games. He's also looking at the main characters/villains that really made him so epic, and Midna was one of them. Even if she didn't get in because of main character. Well, there are different reasons Midna will get in, even for petty ones like being a female and one of the great in-depth characters in their. Consider it fallacious, but they are not factors that should be ignored.