Hello I'm new to the forums, also I'm not from a native english speaking country so please excuse me for any spelling and grammar mistake.
There will be big spoilers to the game.
So I played Little busters couple of months ago, and lately when I thought about the game I realized every route corresponds to the famous 5 stages of grief:
Denial: I don't even need to say who it is, Cute Komari-chan is stuck in denial about her brother's death, she needs to accept that bad things happen.
Anger: Haruka definitely applies, being the most emotional of the girls in her route, her relationship with her sister, she need to learn to forgive her family and move on.
Bargaining and Depression: A bit tricky here I originally thought Mio fit the depressed bill, but after thinking about it Kud is far more likely candidate. Kud has a very bad image of herself, thinking herself to be useless, a failure and a coward for not visiting her mother (If someone played Kud's after story, can he tell if her mother is alive?) after the missile catastrophe, she needs to take two steps, first overcome her fears and leave the safety of the dorms and second believe in herself and her friends to overcome her "jail".
Mio fits the bargaining, but not in the usual sense, she bargains her life for exchange to her "altenate?" personality, she gets out of it when she realizes how she hurt her friends with this compromise and that she is forgiven.
you might be able to switch them around, especially since Mio has a lot of suicidal undertones to her story (going into the sea) that also fit depression.
Now to the interesting bit, acceptance, Kurugaya accepts where she is, and that her goal cannot be reached, you can perhaps say she's stuck accepting what she can't do and she can't move on. Fittingly her route ends only after the main story ends, and everyone comes to terms with the bus crash.
Again I apologize for any mistake I might make and thank you for reading this, What are your thoughts, do you think maybe other characters fit other places?