Tsubasa RESERVoir CHRoNiCLE contains characters, weapons, worlds/countries or places from different series, besides from some original (which were created for this series). CLAMP's Crossover series for Tsubasa are: * Card Captor Sakura * xxxHOLiC * X * RG Veda * Chobits * Clover * Magic Knight Rayearth * Angelic Layer * CLAMP Gakuen Tanteidan * Miyuki-chan in Wonderland * Shin Shunkaden * 20 Mensou ni Onegai! * Gakuen Tokkei Duklyon * Suki, Dakara Suki * Tokyo Babylon * Kobato * Gate 7