Gleeful and Grumpy Pairing

What happens when you combine The Pollyanna and The Cynic? You get a Gleeful And Grumpy Pairing. Often a source of comedy wherein the gleeful character gets the grumpy character into wacky situations that the former never would have thought of. But they can also be a great source of heartwarming moments, where the optimist can bring out the best in the grump... Or it could backfire, and the grump could bring out the worst in the optimist.