Roommates 2007/WMG

The Makeover Fairy is Jareth's long lost (half-)sister from his father's side!
They both Instant Cosplay Surprise for no apparent reasons, appear when you least expect them, have some questionable quirks of taste (pink vs. glitter) the list goes on and on.

From his father side: If der Erlkönig decides that you need a makeover he won't stop with just you. THE WHOLE WORLD GETS IT! (As much as we can see from the published parts of the 2012 Mind Screw arc anyway.)

The magic family tree is the unholy bastard child of an elaborate Celtic Knot and the Timey-Wimey Ball.
Just look at it! And why not? This is a place where personifications of dreams and concepts can walk amongst the muggles.

After the Dreams arc, Jareth will be skittish around Sarah...
...both because of her being creepily impersonated by Odile and because he wonders if it's his obsessiveness with her that prevents him from the Character Development needed to stop being a villain (or at least be so bad at being good). He'll get over it eventually, probably with some furthering of his character, and Sarah may allow him a date (or at least have missed him).

Dark!Jareth will be easily defeated in the Dreams arc
This isn't so much the post of one person, it's been noted by everyone on Deviant ART's forums. Jareth was not cast as the villain in the story of his dream, so his Super-Powered Evil Side can't use his 'go with the story at all costs' Freudian Excuse.
 * Ummm... but it is. Namely mine I just like to comment a lot. (Most people people bet on Armor-Piercing Slap or a "Shut Up" Kiss by Sarah.)
 * Jossed. All three!

The zombie invasion ended because Dresden reverted to his Changes characterization offscreen
I can't be the only one annoyed that all the zombies disappeared with no explanation. So I'm going to say that either Harry Dresden or the Doctor figured out a way to make them all re-dead. After all, those two do have something of a track record when it comes to genocide...
 * Not really without explanation if you read the Artist comments (poor zombies were no match for the combined powers of the residents) but it's still an Offscreen Moment of Awesome.

The Building is Jareth's new castle and the 'verse his domain.
Word of Ashe that "...every magical "court" has a theme... The Goblins are "unwanted".". Now this place is full with story rejects, (fallen sympathetic villains, under-appreciated "heroes", supporting characters sacrificed for the sake of someone else's story etc.) who fit the description quite nicely. Jareth doesn't own the place literally but it's his metaphysical / mystical domain, even if the residents are clueless about it... it's okay he was never big on ruling things anyway. This also explains why is he so territorial about the place and it's residents.