I was a Kristoff fan. Key word: was.
He and Anna had great, snarky friend chemistry in the first movie. Shoving them into a romance was fine, I guess, but Frozen 2 just proved they absolutely do not work.
All he cares about is his proposal. His entire personality in Frozen 2 shrank down to "must propose." That's it. It's not about supporting Anna's emotional sanity, it's not about helping find the truth, it's about his moment, his ring.
The world is ending, and he's totally self-absorbed.
He is visibly jealous that Anna is prioritizing Elsa, her one and only family. Anna's worried about her sister running into fire and dark seas, and Kristoff is literally tapping his foot like, "Um, hello? Me? Remember me? The boyfriend?"
It's so pathetic. It makes him a total jerk.
He was a total jerk. He went from being the reliable, 'I've-got-your-back' guy to a pouting, insecure man-child.
His entire B-plot was "how do I propose?" while Anna was, you know, literally trying to save the world and find her sister. Read the room, dumbass.
And when his clumsy proposal fails, he doesn't talk to her like an adult. He just... leaves. He ditches her in the middle of an enchanted, dangerous forest because his feelings are hurt.
That's not a "rock," that's a pebble.
He did nothing. He sang a cheesy '80s music video which was funny, but pointless and then showed up at the last second to be Anna's Uber.
That's it. Sven was more helpful.
And the worst part is the communication. It's been THREE YEARS. You're telling me in three years, this grown man (who's older than her) still can't use his words?
He has to ask reindeer for relationship advice and then just ghosts his girlfriend when things get tough? It's pathetic. They regressed his character to zero.
Their romance is 100% the old-school Disney romance playbook, just with a "modern vibe" filter slapped on top.
The "modern vibe" is just that she's "adorkable" and he's a "fixer-upper" instead of a generic prince.
But the script is the same: meet, have one (1) adventure, and now the only possible next step is marriage.
There's no real substance or development. That's why his entire Frozen 2 plot was the most tired, basic, 1950s sitcom trope ever: "How do I, the big dumb man, ask for marriage?" It's not a real, modern partnership; it's just a relationship checklist. It's shallow, and it proved they're way more interesting as friends.
Your description is perfect.
He was totally self absorbed for 2 hours and in the end they fixed it with a "what do you need" line (when Elsa wasn't around and he could actually talk to Anna, too easy like that!) and the irritating "my love is not fragile" when it was so fragile that he did nothing but thinking about a stupid proposal for all the movie.
They wrote a trainwrack and tried to fix it with 2 lines.
They surely worked better as awkward boyfriend and girlfriend.