Kinda feels like some of them are actually trying to help her.
Maybe the one in the end is warning her that she's going to be noticed by that teacher if she keeps looking.
@Doomer We've always been shown the guy is being followed by his "victims" and is hated by said ghosts, not the other way around. So it's probably a ghost of a victim, warning her that catching more of his attention is bad.
Either that ghost is another looks-disgusting-but-actually-nice ghost warning her not to attract his attention, or that ghost is controlling that dude and making him kill people? So Mieruko's power may expose it or something like that
The spirit is right.
Protect them from what? Why Miko have to protect anyone? She is being influenced by what she sees into thinking that she has some sort of obligation.
I mean he's not the worst guy tbh. Mostly just cat ghosts and that one that followed him from the park. That other guy she saw at the restaurant had a bunch humans. Also the ghosts don't necessarily follow those that killed them.