Lucky Charms is my all-time favorite, but I also like-
S'Mores
Crunch Berries
Frosted Mini Wheats
HBOO Vanilla Crunch
HBOO Clusters
Cocoa Pebbles
Fruity Pebbles w/marshmallows
Corn Pops
Apple Cinnamon O's
...basically anything loaded with sugar and/or marshmallows
Loved French Toast Crunch, but they stopped making it (naturally!).
Back in the 80s they made a cereal called Just Right that was really good.