My thoughts for Hinata can be described in my post in the Favorite Character topic:
To help add more content to this discussion, let’s speculate! It’s been heavily implied that a large part of his regret was him failing to catch the ball in that winning game, thus causing a large spiral into his use of drugs and overall dissatisfaction with life. Thus, I feel that his regret in life was that he didn’t feel like he was of any use. That explains also why he was one of the last characters to leave the afterlife. He only finally came to realization that he was truly useful after everything had settled down and everyone else had been able to move on.
In that sense, I also feel him as a very relate-able character. I’m sure each and every one of us have questioned at least once whether their life was of any use, and Hinata gives a more solid foundation, teaching us how you can be useful simply by being there and being a genuine friend to others, and I love that part of his characterization as well.
I’m surprised I didn’t feel the same way towards Kud from Little Busters but eeeeh what can you do when she doesn’t really do anything to fix it, unlike Hinata