I'll put Kaguya.
Woman had her zetsu disguises before the manga started and when history started a new to be always hidden, then after that lies of over a decade as he's this Madara's will.
Then Kaguya gets mentioned by Madara for the first time as she's that sage of 2x3 paths mother and she ate the fruit, and awakened the Juubi.
Later on Hagoromo says the Juubi got mad at her. And she got 2 sons but one was always mysteriously unknown and never carved into history.
Then it appears zetsu messed everything up for over centuries just for his mother's revival. And boom she comes, stronger than Juubi which also appears she is the Juubi. So much chakra that her brain is corrupt and can't think clearly, this is also clearly because of the effect of all natures combined, Juubi got the nature of trees alongside other grass weeds that made her in a permanent crack mode. And after that if not for all the nostalgic and classic moments. She disappoints.