They’re GRRRRRRREAT!
Topher’s Breakfast Cereal Character Guide lists characters that appeared on cereal boxes and in advertising — from the Biblical Elijah, featured on Post Elijah’s Manna cornflake cereal (later to become Post Toasties) in 1904, to the life story of Cap’n Crunch, to the recent Hulk and Spider-Man cereals. It’s fun to see so many cereals and characters here that I had forgotten.