Number 65

Number 65, or Rokujugo, is a mechanical creature made by the European Branch Science Division of the Black Order.

Appearance
Number 65 normally appears to be a cylindrical light blue creature with a long tail/leg/extension cord coming from his base and running normally somewhere off screen. His basic appearance bears similarity to a stereotypical ghost with round eyes, the number 65 on his forehead and a 'X' shaped patch across what is revealed to be a small mouth with sharp teeth.

Plot
In anime-only episode "lenalee's love", Komui shoves somthing into 65's teeth to turn him into "macho 65".

Trivia

 * Number 65 spends his time wandering around the European Branch, likes children, and dislikes Komlin II.