As mangaka, Clamp has unusual hobby to crossover their own characters in their
works. Just count on Clamp Campus series [ CCD, Duklyon, 20 Mensou ni Onegai!],
X, AL, Chobits, XXXHolic,. . . the last and the most crowded serial, TRC. Crossover
means using characters from several different series in a story. Usually, the
amateurs do it in fanfic & doujinshi. Since Clamp started as Doujinshika,
looks like their old habits hasn't changed yet.
Most of the illustrations were drawn for Clamp in Wonderland Music Video. Some
were for merchandise like phone card, poster, etc. In 2003, Clamp has published
artbook, Clamp Southside & Clamp Northside. Southside part has many of the
art below.
