The Cooper Clan is the most successful lineage of master thieves in history. Numerous grand heists have been performed by various Coopers throughout history, occasionally through assembling other thieves around them to form a Cooper gang. The Cooper Clan has often clashed with criminal organizations due to its honor code, including the Fiendish Five and the Klaww Gang. They have also bumped heads with rival thieves, such as Clockwerk or the Le Paradox Clan.