This is where you can find all of the basic information about Hibari. I can't say it's spoiler free, since some of it comes from later chapters. Read at your own discretion :P

Katekyo Hitman Reborn! : a brief introduction.
Profile : the most basic of information.
Appearance : don't judge him based on his looks.
Weapon : his tonfa at the ready.
Name : how it fits him perfectly.
Personality : an overview of his traits.
Leader : in charge of the Disciplinary Committee.