Neville and Luna had the most awkwardly adorable courtship ever. Her Dad scares him but his Gran thinks Luna is the best thing since cauldron regulations. After they get married in the most bizarre wedding ever (all the bouquets are of really ugly flowers and when people ask about it Neville just goes off on long-winded lectures about the intricacies of the table decorations and do be careful not to insult the bouquet on table four by mentioning rabbits otherwise it might try to eat you while Luna nods and says that they’re all full of nargles too) they then go on a world-tour honeymoon. Neville collects lots of rare plants while he and Luna search for the Crumple-Horned Snorkack. Then they come back and Neville’s hired as a an assistant to Professor Sprout (because she heard him talking at his wedding and was very impressed) Eventually Sprout retires and she recommended Neville as her replacement and he and Luna and their two children (who both have ridiculous names that no one can pronounce) move into a charming house on the edge of the Forbidden Forest and the family spends their summer Saturdays walking through the woods chasing Nargels and collecting specimens for class.
“'You're worth twelve of Malfoy,' Harry said [to Neville]. 'The Sorting Hat chose you for Gryffindor, didn't it? And where's Malfoy? In stinking Slytherin.'”—Harry Potter and the Philosopher’s Stone, Chapter 13
“'We were all in the D.A. together,' said Neville quietly. 'It was all supposed to be about fighting You-Know-Who, wasn't it? And this is the first chance we've had to do something real – or was that all just a game or something?'
‘No – of course it wasn’t –’ said Harry impatiently.
‘Then we should come too,’ said Neville simply. ‘We want to help.’”—Harry Potter and the Order of the Phoenix, Chapter 33