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Over the course of the interviews released in 2017, Eiichiro Oda revealed some events in the manga which weren’t planned well in advance:
–Vivi being Princess
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–Shanks appearing in Marineford War
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–Ace being Roger’s son
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–Lucci being a villain
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–Doflamingo and Corazon having blood relationship
–Shichibukai appearing in the manga. The series was originally supposed to be a story to fight Yonko, not Shichibukai
–Supernovas still surviving in New World. Oda thought about half of them would have dropped out already
–Trafalgar Law being such an important character. Oda thought Eustass Kid would become an important character, though