Broken Base: There's a bit of contention over whether it was a good idea to keep the True Fae largely off-screen antagonists for 2E, instead giving much of their more personal role to their chief agents, the Huntsmen (the writers have justified it by saying one of the major components of a Huntsman's physical body is the desperate desire of their Keeper master to recover their favorite toys-being their master in part, in other words).
Complete Monster: The True Fae cause all the bad things in this line out of boredom. Let that sink in for a bit.
The books provides an example Gentry turned Charlatan with Shrike. Shrike loved to take humans away and torture them for consumption later. One time when she was looking for another victim, she found serial kidnapper Earnest Marker. She was intrigued that he would kidnap someone but not eat them. Eventually she became fascinated by him and started to understand why earnest did what he did, he saw people (especially children) as abstract qualities of humanity instead of actual people. As such, the Shrike became a Charlatan because she connected with a human being that was just like her.
Darkness-Induced Audience Apathy: Averted. The authors were so anxious about this happening that they put a paragraph or so of narration into nearly every book clarifying that yes, there are things worth fighting for, and that "for all the madness, there is also wonder."
Ensemble Darkhorse: The entire game line is something of this to the New World of Darkness in general. The game was originally supposed to consist of a limited run of six core books (and even that was only because the publisher was convinced to expand from the intended five). The line became so popular that they released three more print books, a PDF-only tie-in, and several pre-published adventures for Storytellers to use.
Evil Is Cool: The True Fae are good candidates to qualify as being the sickest, most twisted bastards in the New World of Darkness (with some tough competition). And fans love them for it.
Fanon: The oft-repeated anecdote that changelings are how the True Fae reproduce. It may be - Changelings can indeed become True Fae, and start making Changelings of their own - but the actual book the idea comes up in, Equinox Road, also suggests other ways for True Fae to come into existence, such as for a bit of Arcadia to develop a Name. Nevertheless, the idea fits so thematically the fandom tends to embrace the idea as Word of God.
Genius Bonus: When describing Treasured, who were objets d'art, the painting they reference is "The Roses of Heliogabalus". Read the description. Sounds exactly like something a True Fae would do.
Jerkass Woobie: Huntsmen. Yes, they're sadistic Manipulative Bastards who go out of their way to torment existence for daring to be physical...but existing is torture to them, and they really don't want to be here on Earth-the True Fae invoked a Contract that forced the Spirit of the Hunt that composes them into unnatural physical form and forced to bring back a changeling if they ever want to return to normal.
The True Fae themselves. Yes, they're insane monsters, but any given True Fae is potentially a former Changeling, and thus a kidnapped abuse victim who finally lost the fight for their sanity.
Narm: A line in the Rites of Spring sourcebook: 'But anywhere the juice ran, the wound tightened, puckered up like a nervous butthole...'
Paranoia Fuel: Anyone could be a fetch. You could be a fetch. There's no way of knowing until the Changeling comes back... Or you get hurt with cold iron, which is EXCEEDINGLY rare in the modern age.
Any opening, archway, doorway or reflective surface can be a portal to the hedge. So making sure every door is locked won't do you any good, since they can come out from under your bed, your bathroom mirror or even from the TVscreen!!
Iron Woobie: But even the weakest changeling was able to muster up enough courage and independent thought to escape their abusers. The True Fae are as gods to normal humans, but for all their power, changelings can escape to freedom- and thousands have done so.
Even among other changelings, the Wizened have it pretty rough. They are normally made from shy, sociably awkward individuals, and the transformation makes them even more uncomfortable among others. On top of that, they are often overlooked by the other changelings even after offering their services to them, and they find it difficult to ask for respect due to their aforementioned issues.