"What if a character deliberately mispronounces another character's name, in order to wind them up or something? I know that for "Every name spelled wrong in 'Rings', a mini-Balrog gets its wings", but does it still count if it's not actually a typo?"

It doesn't count if it's actually intended to be like that. ("Rainbow Crash" would not spawn a mini because it's said in a bullying way.)

But it does bring up a whole other interesting conundrum: I sporked a fic once that consistently misspelled a character's name in the narration by dropping the 'y' (in 'Norman Jayden'). The author kept on doing this and doing this and doing this.

And yet, there was no mini, because ultimately the misspelled character ended up being a character replacement in the sporking.

Here, have the character's Stu page for more info: http://ppc.wikia.com/wiki/Norman_Jaden

That's how we got the mini-Camoudile Whark (from Gehn's journal in Riven), the Agatha Christie mini Imhtep, (from a misprint in my copy of Death Comes as the End), and the mini-Discord Zakora (from the captions).

1. No mini. Minis are mistakes in the story, and an intentional misspelling is, well, an intentional part of the story.
   
   2. As Guv said, yes. This creates a mini. Punctuation is part of proper spelling.
   
   3. Again, as Guv said, it's up to the individual author. My personal preference would be to do both, and make my agents have a showdown in the rain against the mini-Sue.

It all depends. I'm actually no more sure on the first point than you are- its something I've never seen before.

On the second point, it is if its the lack of capitalization of a name. Improper punctuation (see the various Middle-earths) can also cause minis.

On the third point, that all depends on what the author of that mission wants to do. I'm pretty sure, at least, that we don't have any set rules on what would happen in that situation.