Madaras true identity is hes an Uchiha like Sasuke and Itachi hes their cousin
uchiha madara, ,
Madara Uchiha.
His true name is Madara Uchiha. This name was forgotten by many after Hashirama Senju defeated Madara Uchiha at Valley of the End.
This is pure speculation. Uchiha Madara's parentage is not known.
not knowing whether you like sausages or eggs
Konan did, as did Jiraiya.
He didn't become Madara, he is Madara.
They are different people. Madara saved Obito from death and trained him to carry out his own will, using his name. So Obito used the name of Madara since it's name the other shinobi villages could not ignore. However initially he was introduced as 'Tobi', as an Akatsuki underling.
James Madara goes by Jamie Madara.
Madara.
*SPOILERS* According to the latest manga, yes, Madara Uchiha had been dead for a while now, proven when he was revived with the Resurrection Jutsu by Kabuto. This suggests that the "secret weapon" that Kabuto used against our Tobi-Madara man as a threat was reviving the real Madara. The masked man who had claimed to be Madara himself throughout this entire war is a fraud, and his true identity has yet to be determined.
Madara is not Tobi.