Deidara: He would work as a pyrotechnician and perhaps even sculpt during his free time. He would love working with fireworks, seeing them as a beautiful for of art that pretty much everyone seems to love.
Sasori: He would work as a puppeteer, for entertainment usage rather than fighting. He would also create puppets and sell them to the public.
Itachi: He would grow up to become the heir of the Uchiha, leading the clan and keeping them safe. A high chance that the Uchiha massacre could have never happened (a small possibility it could happen without Itachi’s doing if the Uchiha continued with their plans before Itachi became in charge).
Kisame: He would have never lived through all those lies, and he would most likely have a better life and a better peace of mind. He would spend his days relaxing, maybe even babysitting the Hozuki kids.
Hidan: He most likely would’ve stayed in his village if he never became a ninja. He just would’ve been a normal, laid back resident of his village.
Kakuzu: He would be a wealthy individual in his village, with a small family of his own. He continues to be greedy, though. Nothing could change his money obsession.
Pein: The concept of Pein may not exist. Nagato and Yahiko would still be alive. The Amegakure Orphans would stick together, surviving with each other’s help. They would overall have a better life and would have never gone through such a traumatic experience. The Akatsuki would have never been formed.
Konan: She would continue living her life as an orphan with Nagato and Yahiko, still surviving on their own. They stick together, though. She could have possibly taught her origami technique to others, and may become a teacher for it. The Akatsuki would never have been formed.
Tobi: He would remain in the leaf village, living a normal and simple life. Basically, 90% of the stuff that happened in Naruto wouldn’t have happened. The Akatsuki would never have been formed.
Zetsu: He would continue on just being a servant to Madara, not really doing anything else. Eventually, after Madara’s death, he would be alone.