Peter Pan would be interesting. If you watch the movie HOOK, Peter Pan is grown-up and has 2 children of his own, but he doesn’t remember who he was. However Wendy does (The children’s grandmother in a way.)
Peter Pan flew house to house like August rides from place to place on his motorcycle. Peter Pan also liked games and stories; August seems to enjoy playing mind games with people in StoryBrooke, mostly Emma and Henry as well as messing with Henry’s book of stories.
The water connection is something I didn’t notice but in NeverLand there is mermaid Lagoon.