John Woo

ジョン・ウー / ウーさん, Mr. Woo
A carrier pigeon used by Mr. Kim to send messages and assignments to the Paper Sisters. The sisters name after the famous Chinese film director one of whose trademarks is the use of doves to highlight dramatic moments. The pigeon demands respect and pecks Maggie when she forgets to call him san Mr.. While originally serving Dokusensha Mr. Woo remains a friend to the Three Sisters throughout the series. Source: Wikipedia