In addition to the spoiler from the promo, there were several hints in Manhattan that made me think Nealfire could also be Peter Pan. First, Rumple said that his son had been on the run for a long time. Also, when Rumple offered to turn back the clock and make his son 14 again, Neal had a funny expression on his face and said, “14, why would I want to be 14 again?” Neal likely spent centuries stuck in perpetual adolescence, and probably had to work really hard to grow up.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy