I think Hiccup and Astrid are the best animated couple ever.
I love how their relationship isn’t a major plot point for the films. Astrid isn’t there as a reward for the hero, she is also his best friend (next to Toothless of course). She didn’t stop being a warrior after she became a love interest (and Hiccup wouldn’t want her to, he loves her for it).
They talk about their problems. They fight their enemies together. And they trust each other.