Legion of the Chartreuse Tortoise
The Legion of the Chartreuse Tortoise was one of the Strangely-Colored Secret Societies of the Prime Universe, founded as splinters of the First Horde.
Some were made up of former brainwashed human Horde operatives, who dressed up in animal-themed costumes, while others were made up of mutated animals created to serve the Horde's purposes by Professor Scarper; the Crew of the Copper-Colored Cupids' Fact File on the Secret Societies did not specify which of the two cases applied to the Legion. (PROSE: The Strangely-Colored Secret Societies)
The Mad Elephant and Green Gorilla who were imprisoned in Research Laboratory 6 by the Drove of the Database-Compiling Dromedaries were both familiar with the Legion and its leader. Statements made by both suggested that the leader in question was scary to an elephant but not to a gorilla, suggesting he may have been a mouse. (PROSE: Pessimist and the Dromedaries)