Okay... i take back my words for calling Hayato an idiot earlier... although sometimes he might act like one when he's in front of Tsuna... but he's totally NOT and idiot...
GOKUDERA HAYATO IS A NERD!!!!
i even have some evidence to prove that he's a true nerd.
SPOILERS!!! if you're watching the anime, these contains a lot of spoilers.
Okay... i'll explain if it's too small....he created a somehow complicated system called C.A.I system which he map out all by his future self.... and he even spend a whole lot of time to decipher what was his future self planning to do...XD and he finally found out...!
confused with the future and present self i'm talking about? watch/read Kateikyoushi Hitman Reborn then... =p
PS- Hayato even got 100% for his examinations!
AND!!! i didn't know that Hani likes NERD!!! PLUS Hayato IS the BIGGEST NERD!!! =p