Well, friendship is a big theme. Peter Pan and Henry come from different worlds, and their friendship that develops despite their differences is a central part of many fanfics. Also, the theme of magic vs. reality. Henry is from a more'real' world and has to adjust to the magic of Neverland with Peter Pan, and this contrast is often written about. For example, in some fanfics, Henry has to decide whether to stay in the magical world or go back to his own, which shows this theme very well.
One popular 'Peter Pan x Henry' fanfic could be 'The Lost Boy and the Savior'. It often explores their unique relationship within the Neverland setting. Another might be 'Peter Pan's New Adventure with Henry' which delves into how Henry changes Peter Pan's perspective on things.
Peter Pan might be jealous of Henry. Maybe Henry has something that Peter Pan desires, like a special magical ability or an object. So, to get it for himself, he endangers Henry.
One common theme is the clash of two different worlds. Henry comes from a more modern, civilized world while Peter Pan is from the wild and lawless Neverland. Another theme is the idea of growing up. Henry is on a journey of self - discovery and Peter Pan is the eternal boy who doesn't want to grow up, so their relationship can explore different perspectives on maturity.
One common theme is the exploration of identity. Henry often has to figure out his place in the world of Peter Pan, which is very different from his own. Another theme is friendship. The bond that forms between Henry and Peter Pan or the Lost Boys is usually a central part of the story. Adventure is also a big theme, as they go on quests and face various challenges in Neverland.
Another theme is self - discovery. Henry, who may come from a more ordinary world, gets to learn about himself in the extraordinary world of Peter Pan. He discovers new abilities and strengths, and often has to confront his fears. For example, in many fanfictions, Henry realizes he can be braver than he thought when facing the challenges in Neverland.
One great Henry Mills x Peter Pan fanfiction is 'The Lost Boy and the Savior'. It really delves into their complex relationship, showing how Henry's modern sensibilities clash and also blend with Peter Pan's eternal youth and wild nature. Another one is 'Beyond Neverland' which has an interesting plot where they have to team up to save both their worlds from a common enemy.
Finding a good 'peter pan x link lemon fanfic' can be a bit of a challenge. Since it's not a common pairing, the first step would be to explore different fanfic communities dedicated to either Peter Pan or Link. You could also post in relevant forums asking if anyone has come across such a fanfic. Another option is to search using more general terms related to the characteristics of both characters, like 'adventure' or 'youthful spirit', in combination with their names on the fanfic search engines.
There's also 'Peter Pan and Henry: A New Bond'. In this fanfiction, Henry discovers a hidden connection between himself and Peter Pan. It has a lot of action-packed scenes where they fight against common enemies in Neverland. The way it portrays their friendship developing over time is really engaging.
One great Peter Pan and Henry fanfiction is 'The Adventures of Peter Pan and Henry' on FanFiction.net. It has an interesting take on their relationship, with Henry being drawn into Neverland and learning about Peter Pan's world in a really engaging way.