Mr. Garbage
Mr. Garbage is a regular fly that appears around the cathouse, causing trouble wherever he goes. He's one of the main antagonist as every time he shows up, things get messy.
He loves to land on the Kibble and make it all gross with his germs and bacteria.
Mr. Garbage has been shown to make copies of himself (somehow). Making him able to be on different places at once, there's always a whole bunch of them flying around.
For this same reason he's able to be seen in all cameras, althought his apparitions are quite rare.
He's not really a danger to the cats or the food in the cathouse, but he sure is annoying. Trying to keep everything clean with Mr. Garbage around is like fighting a losing battle.