Hiccup and Astrid had a little boy and called him Stoick jr. Jack and Elsa had another little girl who they called Jacqueline. Anna and Kristoff got married and had 2 kids: Sven and Olaf. Flynn and Punzie went through a couple miscarriages but had baby Eugene jr in the end. Everyone lived happily ever after... (joking too cheesy)

Here's the real ending:
So... um- yeah