Unsung heroes in the Narutoverse? (except Itachi)

[Naijakid]

Ebisu- obvious
Genma-for allowing sasuage fight Gaara in th chuunin exams
Hayate- obvious

 

[Haru70]

Kushina, Mito, Zabuza, Haku, Asuma, Chiyo, etc.

My opinion.

 

[Transcendence]

Danzo, Hinata, Hashirama and Madara. I wouldn't put Minato, since he was basically the main reason Konoha won the 3rd Shinobi war, so he's regarded as a hero by default.