After the third great ninja war, Obito Uchiha was assumed to be dead and was saved by Madara Uchiha. He was the leading character of Akatsuki, who was formidable enough to declare war against all five shinobi nations. Rin Nohara's death shattered Obito's spirit, leaving him vulnerable to Madara's manipulations and fueling his desire to create a world where she could be resurrected. His love for Rin became a driving force behind his descent into villainy.
By adopting the persona of the clumsy and unassuming Tobi, Obito lulled his enemies into a false sense of security. No one suspected the masked fool to be the mastermind behind the Akatsuki, allowing him to orchestrate his plans with minimal interference. Obito was a wielder of Mangekyuo Sharingan, which gave him access to Kamui. By using Kamui, Obito was able to teleport his body to the Dimensional Void, making him ungraspable. In addition, he acquired Rinnegan and became the Jinjuriki of Ten Tails. At this point in time, even Hashirama accepted that he would fall short in front of Obito.