Oreo O's!
I don't even like actual Oreos (too sweet), but the cereal is
I prefer the version with marshmallows but they're usually only sold in Wal-Marts and I don't normally go to Wal-Mart
Honorable mention cereals: Reese's Puffs, Lucky Charms (especially the chocolate version), and Honey Bunches of Oats
I think my favorite cereal is Cinnamon Toast Crunch or fruity pebbles. Both are great. I prefer soggy cereal, though, so I let it sit in the milk for a bit before eating.
I have no idea. I haven't eaten cereal in a long time, and even when I did, I don't remember liking any cereal distinctly enough to consider it my favorite.
I've never eaten cereal much but in the US I really loved Golden Grahams and Fruity Pebbles! In Australia I like Choco Pillows from Aldi.. definitely feels more like a dessert than something I should be eating for breakfast, though.