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The four women who make up the manga group CLAMP (Ohkawa Nanase, the scriptwriter; Mokona Apapa, the lead artist; Igarashi Satsuki, the layout designer; and Nekoi Tsubaki, the character artist) are to manga (and manga turned into anime) what Megumi Hayashibara is to voice acting. They began as doujinshi artists but went pro in 1989 with RG Veda. The original doujinka group was actually ten members (one of whom was a guy), but six of them left (one in 1990, two in 1992, and three in 1993), resulting in the four-woman team we know today. That Other Wiki has a little more information on their contributions and accomplishments since in CLAMP's article.Since RG Veda, nearly all of their work has been animated, a list which includes many of the staple series of anime.A theme that runs through CLAMP's works is that love transcends everything, particularly that pesky little thing called gender. Note that this is not a "love conquers all" kind of thing, as gender/age/being a robot/being a ruthless assassin/etc can be insurmountable barriers to having a functional relationship. No barrier can stop people from falling in love but it may very well prevent that love from reaching a happy resolution. (See the relationship between Tomoyo and Sakura in Cardcaptor Sakura, or the one between Sakurazuka Seishirou and Sumeragi Subaru in Tokyo Babylon and X, or between Kazuhiko and Suu (or Ora) in Clover as prime examples.)Their manga work is characterized by a highly-detailed Shōjo art style, though for budget reasons the designs are often simplified for animation. Their style underwent a noticeable change in the late 1990s when Mokona starting ceding more design responsibility to Igarashi and Nekoi. Nekoi's distinctive character designs are responsible for the "noodle people" description common in fandom. CLAMP also errs on the shojo side thematically (despite being published in an unusually wide range of magazines, including Shounen and Seinen), and thus are very prone to drama and painful family unfriendly or broken aesops. Their work also runs the spectrum with some being extraordinarily cutesy and lighthearted, others being horrifically gory and violent, and others still being a mix of the two or everything in between. Being former doujinka, their work is also notable for a deliberately high degree of Fanservice and Fetish Fuel. Aside from that, Clamp loves inserting alternate versions of previous characters into other works, a concept somewhat connected to the fact that their works take place in a large, interconnected multiverse.A quick note about the members of CLAMP: In July of 2004, they all changed their pen names slightly. Mokona Apapa became simply Mokona, Ohkawa Nanase became Ohkawa Ageha, Nekoi Mikku became Nekoi Tsubaki. Igarashi Satsuki simply switched her family name into hiragana, and her given name into kanji. Nekoi and Mokona had been wanting to change their pen names for awhile; Ohkawa and Igarashi just went along for the hell of it. Ohkawa has since reverted to Ohkawa Nanase for attributions. At least three of them have used their names (partially or entirely) for characters in series: Satsuki as Yatouji Satsuki in X, Nekoi as Nekoi Yuzuriha in X, and Mokona as Mokona in Magic Knight Rayearth, Tsubasa Reservoir Chronicle, and ×××HOLiC.
All Deaths Final: By Word of God, there is no way to bring back the dead. Ever. That being said though, reincarnation is possible and has occurred in a few of their works, with stress on the fact that even if the soul is the same, they aren't the same exact people as who they were in a previous life. However, in Tsubasa Reservoir Chronicle, if a certain Evil Plan is successfully carried out, apparently it will become possible to negate this trope... Even if it costs the stability of the whole of space-time.
Costume Porn: With long, lacy ribbons being a particular hallmark in their promotional art. Oddly, it only occasionally shows up in the actual stories themselves (and almost never in animated versions due to the cost of animating all that billowing ribbon properly).
Chastity Couple: Only a very small minority of Official Couple's have ever been given a kiss scene, much less anything beyond that. Affection between individuals tends to instead be expressed through gentle gazes, hand-holding, hugging, and kisses given in places that aren't the lips (such as the forehead or cheek).
Cultural Cross-Reference: When you see terms such as RG Veda, Ashura and even Samsaara, you know they've been studying Hinduism.
Mind Screw: Deserves a special award! Their latestworks have taken it Up to Eleven frying brain cells across their fandom and leaving a probable legacy of several decades worth of forum discussions, all of which add to the confusion even more. Trying to trace the law of causality after a case of Nice Job Breaking It, Hero would cause more brain damage than the combined screws of Quantum Mechanics, Relativity, and Superstring Theory put together!
Ashura in RG Veda is explicitly said to have no physical sex as part of a curse to end the line of the Ashura clan with them. They don't identify with a gender, either.
In X1999, Nataku is similarly sexless as a result of cloning. In the manga, it's implied that their gender is female, likely due to the fact that their genetic source was a young girl named Kazuki.
In Wish, all angels are explicitly genderless, although many international translations incorrectly used gendered pronouns, with the Tokyopop translation in particular making them all female.
Ruby Moon from Cardcaptor Sakura is technically genderless, but chooses to present herself as female because, as she puts it, girls get to wear cuter clothes and uniforms.
Hana from Gate 7 is strongly implied to be genderless - Sakura calls into question whether or not Hana is female, and then, in response to Chikahito's confusion, neither confirms Hana's masculinity nor offers any form of clarification.
A Shrug of God has also hinted that the Zashiki Warashi from ×××HOLiC may not necessarily be either male or female, playing off old portrayals of the spirits in mythology and artwork, where their gender was often unclear.
Noodle People: They arguably enforced this. When several of their works are in animated form, the character animation design are either good (several works animated by Madhouse) or bad (Xxxholic animated by Production I.G).
One of Us: They're are rather notorious for their fangirling of, of all things, JoJo's Bizarre Adventure. Apart from their roots as shounen-ai doujinshi artists for the series (to say nothing about the rumors of Wish's originsnote Shuichiro and Kohaku from Wish strongly resemble Jotaro Kujo and Noriaki Kakyoin from JoJo. Jotaro/Kakyoin is a very popular pairing among yaoi fans, and Clamp are known to ship it themselves.), the crew are said to have single handedly pushed Jotaro Kujo to the top of a fanart-based magazine poll in 1994. And, yes, they still draw fanart of him◊.They also made yaoi doujinshi of Captain Tsubasa and Saint Seiya before they began doing original works.
Horitsuba Gakuen plays with this by making identical characters twins, so Elda and Freya show up as twins, as do Syaoran and his clone from TRC. (Apparently, CCS!Sakura is TRC!Sakura's cousin, further tangling the Tangled Family Tree). Both Fai and Yuui also show up, which leads to tons of confusion as to which twin is which.
Angsty Surviving Twin: Subaru, after Hokuto's death. Fai as well, whose motivations are all centered around his dead twin.
Half-Identical Twins: Subaru and Hokuto Sumeragi from Tokyo Babylon, and Tachibana and Sugihime from Manga/Gate7, the former of which is an expy of Subaru. Kazehaya looks a lot like Kei, too.
Theme Twin Naming: Subaru is named for the Pleiades. He and Hokuto were born under the North Star, but as she was born first, the actual name ("hokuto") went to her; both are examples of a Meaningful Name. Tachibana ("wild orange") and Sugihime ("cedar") are both named for trees.