Day 7: Faerie

The ways of the fae are subtle indeed. The division of our court seems to fall along different lines every time I look. Frankly, I can't keep up with it. I'm way behind schedule! And now the Faerie Queene is breathing down my neck about recordkeeping...

For some faeries, I know for sure whether they wound up in the Unseelie or Seelie Courts. I just need to figure out which courts the others belonged in. It shouldn't be tough—in fact, it should be a simple binary decision!

NIGHT THE FIRST This must have been the night when everybody arrived in pairs.
Unseelie Court	Seelie Court	No Idea
Leena Greenteeth Oonagh Eelcatcher Lumpy Beeswax Orion Beetlejuice, the Star-Seer Niels Waalwaager	John-o-Bogg, the Whisperer in Dimness Cinnamon Jicklefeather Freddik Ladderswart Brick-Crumbler Nelly Fligg Little Carrot-Fingers	Glittering Annabelle Queen Moonbeam Sweet-Tea Teela, the Sweetie Muddlebug, the Despised Pippi Wallflower

NIGHT THE SECOND This was the night that everybody was supposed to bring an animal.
Unseelie Court	Seelie Court	No Idea
Rigel Kiss-Stealer Delpan Darkwish Anklegrab Bittywitty Gregg Oatroller Golem Urbanus, the Artificial Faerie	Melodea Gleespreader Bigprob Incorrigible Secret-teacher Ondrea Amos Wanderluster Lil' Geoff Inchworm	Hornswall Owemuch Whiterobe, Arch-Faerie Morningstar Lingering-Echo Fetidrot Terribilis Xictorio Leander

NIGHT THE THIRD I remember on this night, the moons over the Realm of Faerie were magnificent.
Unseelie Court	Seelie Court	No Idea
Sad-Eyed Helene Pan Janus the Inconstant, the Two-Faced Nixie Wishbringer Tethys Phoebe Willowshaker	Elara Nightmare Pale Amalthea Callisto, the Frog-Whisperer Blind Io, the Misfortune-Teller Invisible Ananke	Tarvos Puddlebumpkin Steelpan Norris, the Calypso Gnome Gap-Tooth Lysithea Pasithee Dandelion-Sniffer Palindromic Adel Leda

NIGHT THE FOURTH For this night, we were all supposed to study the Sermon on the Mount.
Unseelie Court	Seelie Court	No Idea
Sillydrop Pixiedust Windchaser Ruddledum Queen Nareth Bleakwatch Hassleworry Boggart Tanglemuss	Corniphea Lisselac Heathrow Meadowbatch Worthington Goodfellow Eisathe Soapbubble Yorick O'Deadly	Duke Edge-of-the-Sea Maskless Stranger Powderpuff Figaro Millicent Thinwhistle Rowan Clamsmasher

NIGHT THE FIFTH I have no idea what factored into the division of courts on this night.
Unseelie Court	Seelie Court	No Idea
Four-Eyed Rufus Rex Six, the Waxen Fox Polyamorous Cuocuign and her Fifteen Husband-Wives Marbulon Twenty-One, Apostle of the Over-Marbulon The Nine Multihermias	Barefoot Eleven-Toes Wisteria Janus the Inconstant, the Two-Faced Nixie Ever-Lucky Kevin Seven Five-Banana Arantulus Mister 3,449, the Oldest Living Faerie	Ever-Unlucky Liertiene Thirteen Twenty-Pennies Nochwathe, the Cheapskate Bearthrise, Holder of the Eight Stones Pitterpatch, Three Kobolds in a Trenchcoat Mister 3,448, the Runner-Up

[INTERMISSION]

NIGHT THE SIXTH This was the night when we were all supposed to coordinate our outfits.
Unseelie Court	Seelie Court	No Idea
Ingrid, the Languid Orchid Phlox Rendworm Jallifer Mulberry Grand Faerieduke Elgus Palatinate Hargreave Thistle-Friend	Tangelo Linblossom Cloying Lissa Butterscotch Benthamy Persimmon Saffron Wilderwander Carrot-Muncher Peter	King Rubycrown Goldenrod Mauve-Cheeked Theseon Tabita Magenta Flywatcher Spittlejar Princess Xeatrix Heliotrope Violet Hisserscream

NIGHT THE SEVENTH I could recreate this night with one hand tied behind my back.
Unseelie Court	Seelie Court	No Idea
Redd Sweaterscreed Xeva Raver Recea Eddetta Wedded Sceagwes Raw Zest	Myllion Ninium Pholykkul Oily Lou Jimmy Hulp Ion Muk	Beaver Qaester Illuminium Phil Phinnik Fred Deader Warre Escarre

NIGHT THE EIGHTH I remember that on this night, the faeries were in all sorts of states.
Unseelie Court	Seelie Court	No Idea
Vanishment Vastwhist Mnemosyne Melliodyne Nimblepandy Nellingday Ittlebid Insomnioid Miramont Mythrast	Candela Chillfrieza Tellurix Tinglerex Finneal Feelwell Lerisha Linderscarmiglia Annifez Alphabexyz	Angersoll Anthill Winona Watersea Miss Murders Mindgraspin' Mariann Ninam Noseeum

NIGHT THE NINTH This night seemed to go on for days. Or months.
Unseelie Court	Seelie Court	No Idea
Sunny Daisy Weddlebed Whiskydrunk Frinky Frood, the Insufferable Monchell Milkington Satyrmaster Bacchus Weirdknees	Febrius Notsosimple Novinia Dreadlocker Octosm Finalraffle Augord, the Goblin Empress Decarabia, Marquis of Hell	Tuesta, the Silent Faerie Maylinda Nannysnatcher Julibee, the Queen Bee Thuban, Star of Ill-Fate Janus the Inconstant, the Two-Faced Nixie

Answer Checker: Check

Hints: Although obviously some rule is governing which court faeries belong in, all the faerie names on a given night follow some sort of rule. You could say that the Unseelie and Seelie courts just follow each given rule in different ways. The first night has to do with double letters. The second night has to do with hidden words. The third night has to do with real-world names. The fourth night has to do with first and last letters. The fifth night has to do with numbers. The sixth night has to do with colors. The seventh night has to do with hands. The eighth night has to do with a map of the United States. The ninth night has to do with abbreviations.

Solution/Explanation