Exploiting hate to rally supporters, seeking revenge on anyone who questions him, and running with any conspiracy theory he hears.
Cartman, of course, has disparaged Mexicans often on South Park.
Eric Cartman couldn't even deal with sitting through a funeral, even though he would later be given a million dollars to buy a theme park with.
Eric Cartman also uses any authority he receives to abuse it for his own good, whether it's being a police officer or trying to raise up the Confederate army again.
Eric Cartman repeatedly chases conspiracy theories if they can take down his friends/enemies, no matter how insane they might be.
Cartman is one of the all time great TV characters, btw.