Most Helpful Girl
High School of the Dead for me
Most Helpful Guy
Jigoku Shojuo (Hell Girl)! :D
And School Days! It's like a slice of life meets horror. Not spooky or gory, but these people make such horrible decisions it actually turns scary.
Ghost Hound was a good SoL/psych thriller. Very cerebral.
Then there's the old go-to's like death note, devil man (the 90s movie, there's an old ass, unrelated series by the same name), and high school of the dead.
All every good choices!