I know gyros is not a typical Greek breakfast. But we were 2 days in Samos, so me and my friends decided to have gyros for breakfast. Just for the fun of it.
My normal breakfast is bread and cheese and coffee.
I had liver soup for breakfast in Pnom Pen once. Not intentionally. The menu was rather difficult to read.
For fathers day (back to the subject) I had a very good croissant with real farmers butter and home made jam. And coffee.