Edward Wong Hau Pepelu Tivrusky IV (Ed). Although this name is just a fanciful appellation she made for herself, her real name, Françoise Appledelhi, is also quite a mouthful.
Her father's name is impressive, as well: Appledelhi Siniz Hesap Lütfen. This is, more or less, Turkish for, "Excuse me, Check Please."
Gren's full name, Grencia Mars Elijah Guo Eckener, counts too.
In Mahou Sensei Negima!, Kagurazaka Asuna's name sounds normal, until it is revealed to be fake, with the real, forgotten name being Asuna Vesperina Theotanasia Entheofushia, showing a love of this trope.
And now in the flashback, we have Negi's Missing Mom, Arika Anarchia Entheofushia of Vespertatia.
Also Evangeline Athanasia Katherine MacDowell, with the two middle names usually initialized for short. Just don't call her "Kitty", if you value your health. or Loli Grandma, unless you're Jack Rakan.
One of Jack Rakan's aliases is: "That Damn Guy You Can Stab With Swords All You Like And It Won't Do A Thing, Damnit!"
Sir Integra Fairbrook Wingates Hellsing, one of the main characters.
Alucard, primary agent of the Hellsing Organization, formerly Prince Vlad III of Wallachia, Vlad Tepes Dracula ("the impaler" and "son of Dracul / The Dragon" respectively)
Trigun: Parodied in "Murder Machine": when Vash first meets Wolfwood, he gives an extremely long and convoluted string of names for an alias: "Valentinez Alkalinella Xifax Sicidabohertz Gumbigobilla Blue Stradivari Talentrent Pierre Andry Charton-Haymoss Ivanovici Baldeus George Doitzel Kaiser the third. Don't hesitate to call." Milly then blurts out his true identity, which causes Vash to burst into tears and wail, "I hate it when you call me by my full name!"
Even better: The scene cuts after "George" and comes back for the end, implying that the name he gives is significantly longer.
One of the various answers offered for the question of what the D in Nicholas D. Wolfwood's name stands for was "Dokonokuminomonjawaresumakinishiteshizumetarokakora", Yakuza slang for "What the hell family do you think you're from!? I'm gonna tie you up in a reed mat and dunk ya!"
Dr. Slump had Tsuruten Tsun's wife, Tsuntsunodanoteiyuugou Tsun.
The main heroine's full name is Abriel Nei Debrusc Borl Paryun Lafiel. The hero's full name is Lin Shu Rock Yalulug Dril Hydal Jinto. Those are just the phonetic renderings of their names as well, their names correctly transliterated from Baronh into the Latin alphabet read "Ablïarsec Néïc Dubleuscr Bœrh Parhynr Lamhirh" and "Linn Ssynec Rocr Ïarlucec Dreuc Haïder Ghintec", respectively. The pronounciation and spelling of Baronh vaguely resemble those of French.
All Abh have at least four names. Surname, Social-Rank, Family Founder, Personal Name. Nobles like Jinto and Lafiel add their titles between the Family Founder and Personal Name. So Lafiel is Abriel family, royalty (nei) of the line founded by Dubresc, Viscountess Parnyuu, Lafiel for example.
Subverted in Fullmetal Alchemist, where a being known as "the Homunculus" tries to give "Slave 23" a name. He then goes on "Let's see... Theo... Theophrastus Bombastus... va..." and is interrupted by 23 saying "That's too long!". The Homunculus then reconsiders and says "Then what about 'Van Hohenheim'?". See the Real Life section of this article to see what this was referencing.
An omakeassertedScar's real name is Jugemu-jugemu Gokōnosurikire Kaijarisuigyo-no Suigyōmatsu Unraimatsu Fūraimatsu Kūnerutokoroni-sumutokoro Yaburakōjino-burakōji Paipopaipo-paiponoshūringan Shūringanno-gūrindai Gūrindaino-ponpokopīno-ponpokonāno Chōkyūmeino-chōsuke — and so is Bradley's.
Fireball has The 19th Lord of Uranos' Kingdom's Tempest Domain, Drossel Juno Vierzehntens Heizregister Fürstin von Flügel. That's pretty long.
However the credits, as well as abbreviating it to simply "Drossel", also give her the alternate name "Juno-XIV".
Asura Cryin': Ania Fortuna Somesyuru Crowzenbruhi, in short, Nia.
In Berserk, there's a group of knights known as The Blue Whale Ultra Heavy Armored Fierce Assault Annihilation Knight Corps. In at least one instance, a knight says this whole title in the middle of battle.
Also, it was revealed that Princess Charlotte has a really long formal title, which is Charlotte Beatrix Marie Rhody Wyndham.
In Galaxy Angel episode 3 (original anime series), the Angel crew unearths a missile they recovered from a trash-collecting expedition. A little while after it starts talking to them, it introduces itself as MA347612890 GT40785791 32RS2400Z 17924398 TZRS 2000 modular semiconductor type 452963752391 MQTO GLS-equipped self-computing 0037 293165734285 YGNKTI 0120 YMCA 4126 PPPKG lower-right KKP 53 Normad. Only about a third of this is intelligible without the DVD subtitles.
Aram from Meru Puri's full name is Astale Ei Daemonia Eucharistia Aram.
"Kiss-shot Acerola-orion Heart-under-blade" aka "Shinobu" from Bakemonogatari.
Ouran High School Host Club's Tamaki has a long name compared to the rest of the cast. In the manga we learn that his full name is René Tamaki Richard Grantaine Suou. "Suou" wasn't added in the manga when he said it, but since his name is Tamaki Suou it's probably implied. The mix of Japanese and French names emphasizes his half-French heritage.
In the anime, it's changed to Jugem-Jugem Shit-Tossing The Life Of Shin-Chan's Two-Day-Old Underwear Balmung Fezalion Isaac Schneider 1/3 True Love 2/3 Hangnail Anxiety Betrayal Knows My Name Or Does It Really Ignore Calls Squid Dogfish Halibut Trout-Cod Dogfish This Is A Different Dogfish I'm Talking About The Dogfish Shark Kaluga Angler Ray Yuuteimiyaoukimukou pepepepepepepepe Runny Diarrhea.
The 3rd ending theme of The Law of Ueki is called Kono Machi de wa Dare Mo ga Mina Jibun Igai no Nani Ka ni Narita garu.
Fate/Zero has Sola-Ui Nuada-Re Sophia-Ri. And technically speaking she was supposed to add El-Melloi to that before she got killed.
The Land of Fire's Feudal Lord from Naruto offers "Land of Fire's Konoha-gakure, Land of Wind's Suna-gakure, Land of Earth's Iwa-gakure, Land of Water's Kiri-gakure, Land of Lightning's Kumo-gakure Allied Shinobi Decoration" as the name for a war honor, which the other feudal lords immediately shut down for being too long.
As a child, the First Hokage Senju Hashirama invented a technique which he called "Secret Taijutsu Super Katon Genjutsu Cutting Big Shuriken Double Drop Technique".
The 4th Hokage is prone to giving his attacks comically long and grandiose names, and tries to give one to an attack by Naruto and Sasuke.
In Love, Chunibyo & Other Delusions, Rikka has a parasol that she has named "Schwarzsechs Prototype Mark II". The absurd length of the name is referenced by Yuuta in episode 10 when it falls off a bridge and Rikka calls its full name before it even falls out of sight.
Gambling Emperor Legend Zero: Kotarou's full name is Kotarou Hill Mountain Williams Harrison Jagasatake James Shiroyama. This then later pops up as a question asked in the quiz show Zero plays.
One of the main protagonists in Servant × Service has such a long name that she is usually presented as Yamagami Lucy (abbrv.)note The full extent of her name is unclear and one variant has her name as "Yamagami Lucy Kimiko Akie Airi Shiori Rinne Yoshiho Chihoko Ayano Fumika Chisato Nae Mikiko Ichika Yukino Rena Eri Ai Tamiko Chiaki Emilia Juria Shizue Erina Kazusa Yumeka Natsuki Rara Rieko Setsuri Chikako Azumi" Her overly-long name has been a sore point to her since young and one of her reasons for joining the civil service is to find out the identity of the sloppy bureaucrat who approved her name.
Dragon Ball GT has Gil/Giru, whose serial number is DD4649T22006RS. And every M2 call him with that number, which is kinda funny, and you are able to memorize it easily after a while.
The first transfer student of the Assassination Classroom has Jiritsu Shikou Kotei Hodai ("Autonomously Thinking Fixed Artillery") as her name. Everyone called by Full-Name Basis until they shortened it into "Ritsu".
In Happiness Charge Pretty Cure, the real name of Hime Shirayuki is Himelda Window Cure Queen of the Blue Sky. It's actually quite hilarious when Iona constantly calls her that name and it takes her five seconds to go through it all. Hime obviously tells her to just call her "Hime".
In Yu-Gi-Oh! GX, Misawa uses an anime-only monster against Talia called "Conduction Warrior Linear Magnum Plus-Minus". (Fans have joked that the biggest reason it's not a real card is because there's no font size that would make the name fit on one.)