you can check out "Natsume's Book of Friends" the mc helps out yokais and returns their names it's very heartwarming
Ghost theater is really good too
Ghost theater
So violet evergarden isn't about ghosts but it has an aspect of the mc helping ppl.
So um
Ghost theater
Violet evergarden
My Boo
I would recommend ghost teller. It is a good story
Ghost teller is one of my favorites too
Another one is Phantom High about a human teaching ghost
Maybe try A Fortune-Telling Princess. It's a manhwa, kinda romance-fantasy but the mc helps the ghosts so they can rest in peace
Im in love with this comic. Any recommendation somethinglikevhis? I mean helping ghost related thing?