Youkai
The only Spirit-type Kappa
Hebo, Lord of the River
(Konami designers are fusing cultures a bit here because Hebo is the lord of the Yellow River, but the art is undeniably a Kappa)
A Frank Sinatra song used in Neon Genesis Evangelion; An equip spell that makes it very difficult to out a monster by battle
Fly Me to the Moon Mirror Shield
These two monsters are based on a Rafflesia, a carnivorous plant
Predaplant Chimerafflesia; Traptrix Rafflesia
This is the production company of Season 0, different from the rest of the Yu-Gi-Oh series
Toei Animation
Had an alt art EXCLUSIVE to McDonald's and was one of two ultras in the set
Millenium Shield
This card, based on the Tokoyo-no-Naganakidori (chickens), heralds the coming of Amaterasu
Gizmek Naganaki, the Sunrise Signaler
Raigeki Break My Soul
This monster is based on a lizard and a sundew plant
Predaplant Chlamydosundew
The difference between Joey's initial character and his character later in DM
Joey BULLIES Yugi. meanie
The card type (Monster, Spell Trap) that was not included in the wave
Trap
The mallet this Lunalight card is holding is based on a tale about moon rabbits making mochi
Lunalight White Rabbit
The VS S/T searcher; Selena Gomez's SECOND 2011 hit song
Vanquish Soul Dr. Mad Love You Like a Love Song
Why the Aroma monsters feel like they're part of a Multi-Level Marketing scheme
Their names are based on essential oils and their gimmick revolves around scents/winds
(Aromaseraphy = Aroma therapy)
The number of times they play the Duel Monsters card game
Technically a stronger Spellcaster than Dark Magician
Cosmo Queen
The two guardians of the Underworld (in multiple Asian myths) with an Ox head and a Cow head
Mezuki and Gozuki
The first song to be shown with a music video on MTV; The chair in a 2015 Rank 4 engine
Video Killed the Radio Star Seraph Soverignty
The reason Rikka in Japanese is spelt with the kanji for "six" and "flower"
It's referring to a snowflake
The final villain of Season 0
Yami Bakura
At least one type that had NO representation in the McDonald's packs
(not including types introduced later, of course (THIS INCLUDES DIVINE-BEAST ETHAN IT WASN'T LEGAL YET SHUT UP))
Beast, Beast-Warrior, Fish, Plant, Reptile, Thunder, or Winged Beast
This youkai is half-tea kettle, half-tanuki, and worked as a roadside attraction to make a merchant money
Majespecter Raccoon - Bunbuku
Spellbound as a handtrap; One of Madonna's earliest and most famous hits
Gnomaterial Girl
The reason Sylvan Dancepione has 1200 ATK and was revealed on January 1st
The Spanish tradition of eating 12 grapes at midnight to celebrate the New Year
The random character with a single appearance in the manga who the animation staff decided to upgrade into part of the main cast
Miho Nosaka
The item the McDonald's Happy Meal came with
A preview CD of "Yu-Gi-Oh! Music to Duel By"