Assassin bugs are cool, but my gut says cicadas.
And if anyone is saying any insect that isn't part of the the order hemiptera then you're fake fans. Bees and ants aren't true bugs, they're insects. Respect OP's question, and that includes you too Dirt Owl. Weevils are coleopteras.
Dragonflies, while not true bugs, are super cool. I'm a fan of any predator that biologically perfected their anatomy to be hunters millions of years ago and never had to change much. Crocs and sharks too.