Dear Hiver Friends
Akatsuki's leader from behind the scenes, Uchiha Obito, managed to deceive almost all Akatsuki members by posing as 'Tobi'. Obito managed to describe his role as a Clown in the Organization, so that no one knew that he was actually the figure behind Akatsuki's true purpose (Yahiko's version of Akatsuki).
The reason why Obito hid his identity despite being among his peers was because there was still Itachi who knew Tobi's guise. But at that time Itachi preferred to remain silent because Obito still kept his promise, that is not to touch Konoha and Sasuke.
When Deidara died, Tobi began to show his true figure, but it seemed to be still closed because Itachi was still alive. After Itachi's death, Obito began to reveal his true nature and declared himself to be 'Uchiha Madara'. With the ideology left by the original Madara, Obito began a war against the Shinobi Alliance.
Different when playing the role of Tobi who seems silly and cowardly, Obito's figure behind Madara's identity is a very ambitious and frontal person. And not afraid of the risks that he will face. Obito felt free to do anything after Itachi's death which incidentally was considered a 'barrier' to his plans.
Obito is one of the figures born due to injustice in the Shinobi world. Good people who have been hurt in the past, and want to change the world that hurts them. His strong determination was born as a result of disappointment in a rotten world that once claimed his smile and love.
With his crazy ideology, Tobi the comedian turned into an ambitious Uchiha Madara.