Naruto- well it was his first mission and he was just a kid and i think you meant yamato (When was Naruto scared of yamato? he was once but it was for comedy, it wasn't something serious) I don't remember a character called yamamoto in Naruto. And gaara was a scary ass child who killed people with no mercy, anyone would be scared of him.
Sasuke-Sasuke at that was just a kid, and what kid wouldn't shit his pants after seeing how creepy orochimaru was?
Sakura-nuff said
Kakashi-Again the same thing, it was orochimaru after all and he was in his prime back then.
Suigetsu-Orochimaru probably use to do a lot of experiments with him, that's probably why he is scared of him.
About danzo and gaara I disagree U_U
And about choji I agree to some extent but you're be trolling now right? xd