In my mind, Hannah and Rolf throw themselves off veeery high cliffs while Neville and Luna get married under a clump of Nargles.
But i'm supposing that Neville and Hannah could work. Like, they both have hufflepuff-ish qualities (Though Neville will always be a mighty Gryffindor) and ...well, they both went to Hogwarts.
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Oh, and I'd like to add to your [Moon(I luv you Luna)] list of what we know of Hannah: I think she kind of defended Harry when Ernie McMillan was telling the other Hufflepuffs that Harry was, according to him, the Heir of Slytherin in CoS. So bonus points for N/H.
Ah yes, i forgot about that. So she was a nice hufflepuff during that time. Neville's nice as well ... match made in heaven ... maybe ... lol.
sassyne and Nasuada, i believe NL is perfect too. See-this is where i wish JKR had never given us that family tree.
I guess they just met up again sometimes after school and got together. At least Neville can enjoy free drinks from the Leaky Cauldron (where Hannah becomes the new landlady).