Uchiha's.

[Sage of Nature Creation]

Like Obito said, it is a curse called HATRED that was passed down from the elder son to the Uchihas. However they are not all messed up, they are all simply unhappy with their fate of coming in second to the Senju. There are people who are not insane like Shisui, Kagami and Mikoto.

 

[Uchiha Legacy]

Why is Naruto Uzumaki so emotional?

 

[Flawž]

Why is Naruto Uzumaki so emotional?

sasuke fanboy. and im pretty sure sasuke is more emtional then naruto.

 

[JKakano]

Why is every uchiha emotional and messed up in the Head. Itachi was probably the most normal one out of them all but he is still messed up. Is it a trait that they inherit from the first son or is it becuase to gain more power, you need to do the unthinkable and kill ur friend/family member.

Agreed all uchiha planned attack the leaf. its seem only itachi and shisui who are not like them. Madara are definitely greed and power hungry. obito is mess up. sasuke mess up too (nothing to do with itachi, Sasuke is a big boy, he need to control with his feelin NO EXCUSE.) other uchiha were trying to attack leaf village.

 

[JKakano]

itachi was messed up in the head too

Spoiler

You must be registered for see images

is that fact? nah its only obito words.. itachi told sasuke truth and very clear he wasn't mess his head.. only follow the order and protected leaf unlike any uchiha except shisui..