Look, I know this question has been asked a million and ten times. But I just find comfort amongst conversed clarification & I know we redditors tend to be gods at conversing through screens.

Anywho, I recently got into a debate with a friend and he was INSISTANT that Madara's MS ability is time manipulation because it's directly shown In a Naruto Storm game- but none of the Naruto games are canon. If they were, Shisui's Susano'o would be canon as well (and it's not. Comedically enough, he and I agreed on that note.)

I've read a bunch that some fans speculate that Limbo clones are his MS ability but that honestly doesn't make sense to me. Limbo seems to be more of a Rinnesharingan ability.