He is opposing of the established nations, so yes.
Well, evil is such a relative word. It all depends on which point view you're looking from.
I mean, in one way he's trying to make peace... in his own twisted way. Also, he's had a quite hard life filled with bitterness. But what makes someone evil, their actions?
If my clan dissed my I'd get pissed, too, btw. But yeah, his like one of the main antagonists of the serie now, so from the protagonists point of view, he's evil.
Yes
Madara Uchiha but the worst criminal would be Sasuke
Sasuke Uchiha and Madara Uchiha
Madara is by far the strongest. If Itachi was stronger he would've killed madara himself.
No
No, Madara Uchiha is the leader of the Uchiha Clan. Obito is merely a member and he is dead.
It has not been revealed in the Naruto manga or anime if Madara Uchiha dies.
He had at least five brothers. Four were killed in battle, when Madara was still a child. He also had a younger brother, Izuna Uchiha.
Uchiha Madara was a highly skilled ninja who lived years previously. He helped lead the Uchiha clan and was one of the founders of Konoha. He also trained Itachi. Madara helped Itachi with the Uchiha Clan Massacre.
No
The author never revealed if Madara Uchiha married anyone.
The desire to conquer the Earth, Immortality, and the means to which he goes to create the Ten-Tailed beast.
Tobi is Madara Uchiha in Tobi's form!! Obito Uchiha is dead and completely unrelated besides the fact that he is an Uchiha too.