Lucky Charms with extra sugar piled on top. I know that defeats the purpose of pre-sweetened cereal, but hey, I make my own rules!
I haven't eaten cereal regularly in years, but my favorite when I was a kid was Peanut Butter Cap'n Crunch.
I haven't eaten any since I was a little boy. Dontcha know Trix are for Kids! Grow up...lol I only have museli with yogurt and a splash of juice these days. My daily go to is homemade hummus in the morning on a bagel.