These are Navboxes for individual series, such as Card Captor Sakura or Clover. Navboxes should include links to all relevant pages of a series (key terms, media pages, main and secondary characters, ect.). Given the many crossovers in the CLAMP Multiverse, only use navboxes to link to pages directly involved with the series.
Example: A character in Magic Knight Rayearth, Hikaru Shidou, has a proxy in the series Angelic Layer. Though their individual character pages will reference each other, do not link the AL Hikaru as a character in the MKR navbox and do not link the MKR Hikaru to the AL Navbox.