We went character hunting 3 weeks ago. We found Thing 1 & 2, Cat in the Hat and others in Dr. Seussland. Thing 1 & 2 and the Cat in the Hat were at the Confisco Grill. We found the Marvel characters except for Spiderman. We got Spiderman at Confisco Grill. He did spend time with our kids for which I really liked.
Yes, you can find them outside of the character breakfast but it may take a little effort and being at the right area at the right time. But I find that being at the character breakfast can also be a little hard; they're not quite as organized as Disney- we had to speak up because Spiderman missed our table. We left also left just after Thing 1 & 2 did rounds again but before they reached us; they all don't arrive right after each other. It was a good 40-50 min. before Thing 1 &Thing 2 came around, and then Cat in the Hat disappeared.
Other than the green eggs and ham sandwich, breakfast wasn't anything special. There were fruit and pastries, bacon, sausages and finger waffles. Gratuity is already included at 18%( a lot for a buffet) you couldn't tip how you wanted to.