Kuroo doesn't meet his demise in the manga. The plot doesn't involve his death. He continues to play an important role and contribute to the story's development.
One common theme is friendship. Their strong bond is often explored in various ways, like how they cheer each other up when one is down. Another is growth, both as volleyball players and as people.
I have no definite answer. Sometimes manga series end when the story feels complete to the creator or when publishing circumstances change. So, we'll just have to wait and see.
No, there isn't. The main emphasis of Haikyuu is on teamwork, friendship, and the pursuit of excellence in volleyball. Love stories are not a significant part of the plot.
The Haikyuu manga is indeed over. It had a great run and left a lasting impression on readers. The story came to a satisfying end, tying up loose ends and giving closure to the characters' arcs.