Floyd is a real flea bag of an alley cat, with a lazy eye and a nicked ear.  He's got a coat that appears as a brownish-greenish-gray, with some unusual markings on it.  And he has one red eye (his lazy one) and one blue eye.  Like his friend Muriel (another alley cat), he makes his living by scrounging through the city trash cans and dumpsters, searching for anything which could even approximate a meal.  He survives Muriel's domination over him by sweet talking her with pet names like "snookums" and "my little nightingale".  But he's a sucker for a free handout...even if it ends up getting him captured by Dr. Valentine, and exposed to the electro shock applications which, in the end, make him an evil minion of Evil Martin.  (Note the post-transformation effects in the screen shot below).

Quote: "Wait up, snookums!"  (as Evil Floyd: "I say!  I've caught a mouse!")

Origins of the character: This character does not appear in Robert C. O'Brien's book "Mrs. Frisby And The Rats Of NIMH", or in the original The Secret of NIMH.  He is seen solely in the sequel.

Floyd after his electro shock transformation: