Number Six (No.6) is a character in the anime and manga Battle Spirits Shounen Toppa Bashin
Number Six is seen only as a shadow.
Number Six is a member of Thousand Spirits Group's Numbers Elite. Despite this, Six is seen only as a shadow in the manga, and the only implications of this characters existence in the anime is on a monitor which King Uchuuchouten was using to communicate with the other Numbers.
There is some speculation that either Baito-kun or Baito-san may hold this Number.
Battle Spirits Shounen Toppa Bashin manga