So, if you were to ask me, Hilda and Ravio are two of the best characters in the entire Zelda franchise, whether it be their designs or their characterization. Simply put, I was enraptured by how they were written. They prove that there is so much more to the concepts of courage and wisdom than their conventional definitions. As you play through the game as Link more and more, you realize that Hilda's missives and messages are, while at first glance a benign beseeching for help, have a hidden bitterness to them. She is envious of Hyrule's prosperity, she covets the wonders and brightness of the Triforce, and she will stop at nothing - absolutely nothing - to ensure her kingdom's survival. Though it's easy to see coming, the crumbling of her facade at the end is no less meaningful and you as the player personally feel the repercussions of Lorule's tragic history.
What you DON'T see coming - or I didn't at least - is when Ravio cheerfully flies in with Sheerow, a bag of riches over his shoulder and his usual charm over the other. His bunny mask falls away and it's revealed that he's Link's Lorule counterpart. In a way, he's "dark" Link. And that's what I love about both him and Hilda. They are the dark counterparts, but that doesn't have to necessarily mean darkness in the expected sense. You know, the edginess of someone like Shadow to Sonic, or Dark Samus to Samus, or even the previous incarnation of Dark Link to Link back in OoT. In this case, it's darkness in the most substantial interpretation possible: Ravio, though overtly a coward, has his own brand of courage - one in which he risks treason, in which he traverses dimensions without any guarantee he'll ever make it home, just so he has the chance of helping both Hilda and Lorule through such troubled times.
Hilda, though her ambition and desperation have seized her and caused her to make these extreme decisions, in her heart of hearts just wanted to see her people thrive again. And so when Ravio comes back, when Link and Zelda selflessly restore Lorule using their Triforce, she is overcome. Her particular brand of wisdom is one of, dare I say, self-awareness. At first, she CERTAINLY isn't very aware of her own actions, but she learns from her mistakes at the conclusion. She was prepared to make the ultimate sacrifice - of herself and her own integrity - just to keep things from falling apart. Her wisdom is a more realistic sort than Zelda's: it's one that understands the harsh realities of the world and only comes about from experience, and trial and error. Long story short, Link Between Worlds is a game that shows people there's always more to someone than meets the eye, and labels are meant to be discarded in favor of real motivation, and that's why I love Hilda and Ravio so much.
