After reading Walk To Death, I think I finally understand Komachi. I bet she’s similar to tokiko.
They both seem compelled by the desires of others and both have unconventional ways of expressing their emotions. They do differ a bit emotionally though. Tokiko made no secret of her emotional deficiencies and didn’t seem to understand why her behaviour made others uncomfortable, while Komachi reads to me as having a similar emotional disorder, just being a lot better at faking it. She knows how to pretend to be normal, which Tokiko never had any desire to even attempt.
If it turns out Komachi’s “cursed” in someway like Tokiko was, I would not be surprised. Would also explain why people keep almost dying around at this school. If Satsuki lost her magic corpse-vision there would be a bloodbath.