This is a bonus chapter where I show you a list of yukkuris in existence and all their fillings. Please use Google to look up anything you don't know, as I don't feel like explaining things myself. Bold and italic ones are yukkuris with inedible fillings.
Reimu: Red bean paste
Marisa: Black bean paste
Rumia: Raw meat paste
Cirno: Soda ice-cream
Daiyousei: Mint frosting
Meiling: Mapo tofu
Koakuma: Caramel
Patchouli: Raw cream
Sakuya: Custard pudding
Remilia: Assorted meat
Flandre: Spicy meat
Letty: Baked Alaska
Chen: Chocolate
Alice: Custard
Shanghai: Nougat
Hourai: Truffle nougat
Lily White: Marshmallow
Lyrica: Cherry taffy
Merlin: Strawberry taffy
Lunasa: Chocolate taffy
Youmu: White chocolate
Yuyuko: Sakura mochi
Ran: Rice
Yukari: Natto
Suika: Sake
Wriggle: Fruit punch
Mystia: Chicken
Keine: Boiled vegetables, but becomes beef jerky during full moon nights without an explanation
Tewi: Carrot cake
Reisen: Udon noodles
Eirin: Pinkish syrup-like liquid with medicinal properties
Kaguya: Cup noodles
Mokou: Yakitori sauce
Aya: Coffee
Yuuka: Mocha with sunflower seeds
Medicine: Death-inducing purple poison
Komachi: Gojiberry
Lily Black: Roasted marshmallow
Eiki: Hummus
Shizuha: Pumpkin pie
Minoriko: Sweet potato
Hina: Bad-tasting chocolate
Nitori: Cucumber soda
Momiji: Maple syrup
Sanae: Miracle fruit jam
Kanako: Boysenberry jam
Suwako: Orange marmalade
Iku: Sour yellow gel
Tenshi: Peach
Kisume: Pickles
Yamame: Cinnamon apple
Parsee: Nonlethal green poison (causes stomachache)
Yuugi: Rum cake
Satori: Cherry pie
Rin: Chocolate pudding
Utsuho: Radioactive materials
Koishi: Banana cream
Nazrin: Cream cheese
Kogasa: Eggplant
Ichirin: Cotton candy
Minamitsu: Tuna curry
Shou: Omelet
Byakuren: Vodka cookies
Nue: Neapolitan astronaut ice-cream
Hatate: Bacon-rich monjayaki
Sunny Milk: Plain yogurt
Luna Child: Crepe
Star Sapphire: Starfruit
Kyouko: Dust
Yoshika: Rotten meat
Seiga: Rose tea
Tojiko: Popcorn, either raw or cooked
Futo: Cream soda
Miko: Lemonade
Mamizou: Leaves
Kokoro: Bitter chocolate
Wakasagihime: Water
Sekibanki: Assorted red fruit jam
Kagerou: Blackberry jam
Yatsuhashi: Cookie dough
Benben: Egg noodles
Seija: Upside-down cake
Shinmyoumaru: Cookie crumbs
Raiko: Golden delicious type apple
Sumireko: Marble cake
Seiran: Gunpowder
Ringo: Dango
Doremy: Warm milk
Sagume: Cookie and cream
Clownpiece: Apple pie
Junko: Mustard
Hecatia: Tri-colored pasta
Akyuu: Mashed cherry
Tokiko: Egg white
Renko: Chocolate cake
Maribel: Butter cake
Rei'sen: Carrot
Toyohime: Peach ice-cream
Yorihime: Assorted fruits
Rinnosuke: Air (basically nothing)
Kasen: Cherry blossom
Kosuzu: Paper shreds
Shingyouku: Sweet and sour sauce
Elis: Wine
YuugenMagan: Golden raisins
Sariel: Angel food cake
Mima: Shrimp
Kikuri: Moon cake
Konngara: Cola
Rika: Black ink
Meira: Tar
Kotohime: Rose jam
Kana: Iced tea
Ellen: Sprinkles
Rikako: Sulfuric acid
Chiyuri: Vanilla
Yumemi: Strawberry
Ruukoto: Nuts and bolts
Orange: Orange
Kurumi: Butterscotch
Elly: Rotten apple
Mugetsu: Hot cocoa
Gengetsu: Melted butter
Sara: Raspberry
Luize: French vanilla ice-cream
Yuki: Hot sauce
Mai: Soy milk
Yumeko: Ravioli
Shinki: Devil food cake