Qvarie maintains a wiki in Japanese about special characters of the world, including emojis, of course. Some issues I thought I was the first to raise here were already documented there years earlier.

Specific References

Emoji variants not reflected in Unicode

1. Part 1: pre-Unicode and early Unicode implementations
   • Willcom: leftwards and rightwards Radio Waves (Denpa, Dempa), Oncoming Motorcycle (:motorcycle: or :motor_scooter:), Baseball with Bat instead of :baseball: Baseball-related emojis #67, Record Disc instead of 📀 or 💿 Vinyl LP emoji #71, Exit and Emergency Exit (:running_man:+:door:), Uncle おやじ bald man with one hair in the middle (sir, father, uncle, mister), Squared CJK Ideograph 91CD Important, Jizo (Japanese Buddha), Hachiko (statue of famous faithful dog), several company logos
   • E-Mobile: variant of U+1F612 🤤 😒 with white eyes, Community (people holding hands standing on a globe), Squared HIT Sign, Coin Coin emoji #137
   • iPhone (iOS 5): golf ball More Ball Sport emojis #66 instead of ⛳ or 🏌️‍♂️, Japanese graduation clothing instead of mortar board 🎓, scallops shell 🐚 🐚 (mollusk 🐌), 👄 vs. 💋
   • Disney Mobile (Softbank): Tornado instead of Typhoon 🌀, Shoe Prints instead of Foot Prints 👣, Pacifier for Baby 👶 Pacifier emoji #381
   • J-Phone (Softbank): Teacher emoji was unified with News Anchor into 💁‍♀️ (now: 👨‍🏫), a Planet with Orbit emoji was dropped (because it was also the logo of the Sky Walker service)
   • Vertu: Ginkgo was unified with 🍃 U+1F343
2. Part 2: AI Publishing Symbol Dictionary (エーアイ出版 『記号辞書』 ISBN 4871931838) for NEC PC-9800 series
   • animals: Insect Face, Dragonfly, Dove/Pigeon 🕊️, Grasshopper and Cicada (Cricket in Unicode 10), Mole, Jellyfish Jellyfish emoji #214, Larva / Caterpillar (like some Bug 🐛 variants), Butterfly 🦋, Lion Face 🦁, Animal(?) Face, Squirrel Squirrel emoji #108, Beckoning/Lucky Cat (manekineko) Cat emojis #89, Bird Face, Hippopotamus Hippo emoji #105, Moth Moth emojis #163, Crab 🦀, Sealion (todo) and Seal Seal emoji #102, Shrimp 🦐, Fly Fly emoji #150, Snow Rabbit (with leaves as ears), Earthworm PRI286: Informal proposals list #261
   • people: Man with Silk Hat or Gentleman (monocle in Unicode 10), Man with Hat (:cowboy_hat_face: :man_with_gua_pi_mao: :tophat: :man_in_tuxedo: ?), Bald Person (proposed for Unicode 11), Person with Shaved Head (monk?), Person with War Bonnet = Native American Chief (Feather emoji #149), Samurai Ninja emoji #5, Clown 🤡 or Mime
   • faces: He-no-he-no-mo-he-ji a scribbled face made of 7 hiragana letters (he へ eyebrows, no の eyes, mo も nose, he へ mouth, ji じ outline)
3. Part 3: Jugem → JUGEM emojis list #332
4. Part 4: ASTEL enclosed ideographs and pictographs → ASTEL emojis list #324
   1. Part 4.1:
      • Squared Ideograph 4F4f sumi mark: address, 4EA4 cross mark: traffic information, police box, 5E74 year mark: age, 8077 job mark: occupation, 5E2D seating mark: attendance, 8D85 super (market), 6025 quick mark: express, 8CB7 purchase mark: buy, 58F2 sale mark: selling, auction, 7A0E tax mark: tax included, 7CFB system mark: lineage, strain, 65CF family mark: group select, 6625 spring mark (season), 590F summer mark, 79CB autumn mark, 51AC winter mark
      • Katakana baito for 1. part-time job (German Arbeit) or 2. byte
      • Seagull Seagull emoji #90, Beetle (differs from 🐛 and 🪲), Radish, Uncle ojisan, mister (with beard), Aunt madam, Motorbike (between Scooter 🛵 and Racing 🏍️), Chauldron or Kettle, Steamed Bun (nikuman, baozi, chuka), Sea or Ocean 🌊 (scenery with seagull and lighthouse Lighthouse emoji #159), River (scenery with bridge 🌉), Floating Tube or Ring as in a swimming pool, Fitness Barbell emoji #335, Bike Helmet (cf. 🏎️ and 🏍️)
   2. Part 4.2:
      • Selected Arrow with Question Mark
      • Gakuran (Japanese school uniform, cf. old Apple emojis), Sailor Suit Sailor emoji #351, Tank Top (unlike 👕 and 🎽), Trunks or Briefs or Underpants (male variant of 👙), Skirt (separate from 👗), Cowboy Hat (without head as in 🤠) Fedora emoji #20, Earring, PHS Mobile Phone and Cordless Phone (both distinct from cell phone 📱 and ☎️ and 📞), Notebook or Laptop Computer (basically the same as 💻), Eraser Image Editor Icon emojis #288, Staircase Up and Down Public Signage symbols list #299, Window, Wall, Brick Brick emoji #127, Rock Mountain (distinct from 🗻, ⛰️ and 🏔️), Flagstones or Tiles, Sword (distinct from ⚔️ and 🗡️), Knight's Armor 👨⚔ Soldier emoji #283, (Magic) Wand Magic Wand emoji #160 or Walking Cane Candy Cane emoji #345, Magic Scroll (distinct from 📜), Pot or Vase (similar to 🏺, 🥘 or 🍲), Treasure Box or Chest Box or Chest emoji #77, Pincer Pliers, Ladder Ladder emoji #237, Tobacco or Box of Cigarettes, Tin Can (in Unicode 10), Futon (distinct from 🛋️), Hand Mirror, Kettle or Teapot yakan, Drawers or Closet, Paycheck (as a bag like 💰), Bonus symbolized by an Aubergine/Eggplant on a Stick
      • Katakana TEST with Pencil Below, Diet, Machine or Gadget
   3. Part 4.3: Person Dancing Cossack-Style, Person with Raised Index Finger attention, Abdominal Pain, Black Angry Face (variant of 😠), 😩+🆘, Face with Bump or Bruise beaten-up, Hip Shaking ~ Hula Hoop emoji #63, separate Left and Right Footprints 👣, Soccer Player More Ball Sport emojis #66, Japanese Symbol for Older Driver (cf. 🔰), Computer Mouse 🖱️, Grilled Meat kebab etc. (distinct from 🍖), Broom Broom emoji #128,
5. Part 5: Instant messenger pictographs (Skype Skype emoticons list #253, Microsoft Microsoft/Windows Live / MSN Messenger emoticons list #256, Yahoo Yahoo Messenger emoticons list #255, vBulletin)
   1. Part 5.1: emoticons
      • (Face with) Lips Sealed (with bandaids, so distinct from 🤐 and shush face in Unicode 10), Sick Face 🤢, Puking Face (Unicode 10), D'oh Face (Homer Simpson) | 🤦‍♀️, Grinning Face with Angry Eyes or Face with Evil Grin or Face with Baring Teeth (cf. 😈 and 😬), Rolling on the Floor Laughing 🤣, Exhausted or Sighing Face (😯), Drooling Face 🤤 Yahoo Messenger emoticons list #255, Drunk Face Stoner emoji #11 Drug emojis #114 Skype emoticons list #253, Depressed Face 😑 Emo emoji #4 Skype emoticons list #253, Face with Foot in Mouth AOL Instant Messenger (AIM) emoticons list #257, Face Banging against Wall Skype emoticons list #253, Secret Telling or Whispering (shushing face in Unicode 10), Swearing Face (Unicode 10), Daydreaming Yahoo Messenger emoticons list #255, separate Right and Left Hug Microsoft/Windows Live / MSN Messenger emoticons list #256, Person Mooning Skype emoticons list #253 Butt emoji #334, Pool Party Skype emoticons list #253, Handshake 🤝
   2. Part 5.2: other pictographs
      • Island (with Palm Trees) 🏝️, Wilted Flower 🥀, Bowl 🍜 or Unicode 10, Plate (🍽️ without cutlery), Bandit Criminal emoji #298 Skype emoticons list #253, Clown 🤡, Cowboy 🤠, Ninja Ninja emoji #5 Skype emoticons list #253, Pirate Pirate emoji proposal #339 Face with Eyepatch emoji #148 Yahoo Messenger emoticons list #255, Bat 🦇, Squirrel Squirrel emoji #108 Skype emoticons list #253
      • Circled Exclamation Mark (phpBB)

Emojis proposed but not adopted by Unicode

1. Part 1:
   • N2374
   • N2478, N2486, N2489
   • L2/02-354 = N2655
   • L2/09-081 = N3580, N3581, L2/09-025r2 = N3582, N3583
   • L2/09-114 = N3607
2. Part 2:
   • L2/02-102 = N2417, N2486
3. Part 3:
   • L2/11-196 = N4022, N4115, N4387, L2/13-150 = N4458, N4239, N4306;
4. Part 4: Unicode 7 to 8β
   • L2/14-235 Religious Symbols
   • L2/14-229 Afroji
5. Part 5:
   • L2/15-171 = N4666, L2/15-303 = N4702
   • Food Allergens L2/15-197
   • U+1F946 🥆 Rifle and U+1F93B 🤻 Modern Penthatlon

Unicode Emoticons Quick Chart

Proposals

• L2/09-007 Comparison of Emoticons from Major Vendors by Arle Lommel: Unification of emoticon characters with current proposals for encoding emoji (v1.5, 2008-12-26) – Skype Skype emoticons list #253, Microsoft Messenger Microsoft/Windows Live / MSN Messenger emoticons list #256, Yahoo Messenger Yahoo Messenger emoticons list #255, AIM AOL Instant Messenger (AIM) emoticons list #257, Google Google Gmail/Hangouts emoticons list #252, phpBB, vBulletin.
• L2/14-229 Afroji
• L2/14-235 Religious Symbols
• L2/15-197 Food Allergens

Standard References

• Unicode Technical Standard 51 “Unicode Emoji” (beta)
• How to propose emojis to Unicode
• How to propose other additions or changes to Unicode (required form, email address: docsubmit＠unicode.org)
• Unicode document submission form