Kat is a cyborg and has a very interesting anatomy. Most of his abilities are almost possible with technology available to humans.
Kat consumes vast amounts of food that no biological organs could ever handle. Also Kat consumes far more food than his biological body could ever require. An organic stomach would also have an extremely hard time managing acid that is capable of dissolving metal! Kat definitely has a mechanical stomach and, perhaps an organic stomach aswell. The mechanical stomach would only be used once there is more food than his organic body would require. The...
It seems that Kat hated Coop from the first moment they met. But Kat had just been on the receiving end of a baseball. Not just any baseball. A baseball thrown by Millie... I'm pretty sure that you would have hissed at the first thing you saw if you were in his position!
Coop then attacks Kat with a wave of insults, not the best way to make a friend... Millie does the polar opposite; she welcomes Kat with open arms and insists that they keep him.
How would you feel if you just landed in a foreign country or an alien world and the first creature you meet hates you...
There are several classes in the Catnipian army. Our "friend" that we all love and hate, Mr Kat, is a member of the Catnipian special agents class. He is agent 27B.
The Catnipian Commander has absolute power over the millitary and all Catnipians.
Special agents are given top of the range Catnipian implants, equipment(his coller) and training. The few Catnipians with better implants and equipment is their commander, his son and perhaps their family.