Help - I need names for a script?

It's about a detective in London he is the main character and a gang of criminals who are really pissing him off as they keep robbing banks and have left no clues so far whom they could be. They all dress up in costumes e.g nouns, clowns e.c.t they have code names - I need a name for the police officer and the code names for the five criminals thank you.