Trattoria del Porto has the buffet at Portofino. You can also order off the menu. We usually have one breakfast here during our stay. I cant remember if Sal's is open in the AM. The Gelateria has quick stuff to grab like bagels and the best cannoli filled fresh.
Mostly we enjoy having breakfast at one of the bakeries entering IOA or Universal. They have great coffee and danish/donuts, cookies and croissants. Bagels also and fruit. You can also get breakfast at City Walk at cinnabon, green eggs and ham at IOA. The Marketplace Cafe(Pastamore) at City Walk serves breakfast starting at 8A.