Macavity is an evil cat. I think he used to be Demeter or 
Bombalurina's boyfriend, but abused them so they split. Then Macavity 
came back to haunt demeter, that's why he captures her in the 
fighting scene. He used to be a part if the jellicle tribe, and a bit 
naughty like Mungo and rumpel, but turned pure evil. Mungo and rumpel 
are his workers, but no-one minds them as they do cause trouble but 
arent nasty, bad or evil like Macavity.

From lil-diva-kitty