Wilkins is a corrupt, insane and sadistic dude who makes sure people feel his wrath when they refuse to drink a brand of Coffee called Wilkins, he participates in a special form of Coffee Worship dedicated entirely to Wilkins, he loves all coffee, and you will be on his hit list if you don't.
Wontkins, on the other hand, is a sane, Wilkins hating blob who dislikes Wilkins, but secretly loves drinking it. He always receives the short end of the Wilkins' stick, and Wilkins himself uses him as an example of who he hates. If Wontkins ever says he dislikes Wilkins, Wilkins himself will murder him in cold blood and then make a joke about it.
Wilkins is a brown, lizard like thing with a big mouth, bigger than his soul, but smaller than his undying passion for his own coffee brand. Wontkins, however, is a red blob with a huge nose and some eyes, he once went through a gothic/emo phase, where he dyed his body blue.
As previously stated, Wilkins is a jerk who puts his coffee brand over everything else, even his own house, he is willing to murder any person who personally dislikes his coffee brand, because it's apparently that good, he casually just murders others at random, and it begins to get pretty scary in no time, he is also a coffeeholic, if you couldn't guess yet. His high caffeine levels are what mainly give him his mean personality.
Wontkins secretly likes Wilkins coffee, but it's mainly a secret, he dosen't show love for the Wilkins brand, and says to hate every last bit of it, leading to his doom, however, he has sometimes admit he likes Wilkins coffee while Wilkins himself was nearby. At one point Wontkins went emo and dyed his body blue, although this phase was short lived, as Wilkins said that this won't fix anything, only a good cup of Wilkins would.