Well the only candidate for that would be Henry, right?
Regina, Rumple, Snow, Charming, Zelena and Hook are all alive during Snow Falls, which is where we’re going.
I doubt the “kill” Emma.So…Henry?
Henry would be the only important character who comes into my mind. Probably also the child between Philipp and Aurora. It’s possible they do something which makes Aurora and Mulan impossible to rescue Philipp’s soul so they child could never born.
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“There were thousands and thousands of forms of joy in the world, but that all were essentially one and the same, namely, the joy of being able to love.”
— from the Neverending Story by Michael Ende