Danzo.
Yes they have fought at multiple occasions.
They have fought.
when they fought but sasuke said that does not matter too him anymore
No, he died when he blew himself up using his CO level clay bomb. He used it as a last resort.
actually, sasuke didn't kill itachi. when they fought itachi was hurt or sick, and he died. he never intended on killing sasuke. sasuke didn't know about itachi's past
the last character is sharingan sasuke the last character is sharingan sasuke.
Sasuke fought Mizore Fuyukuma and Fubuki Kakuyoku with Sakura.
Suigetsu was the first person to join Sasuke's team.
Orchimaru
It's like 30 episodes long, starting when Naruto and Sasuke fought each other in the hospital to when Sasuke beats Naruto and leaves for Orochimaru.
When they fought in the valley, Sasuke was just more powerful
It's name was the valley of the end.