BLACKLIGHT:

Reveals hidden stains, damaging all combatants once per battle.

SHPOOMF

A "snack" of some sort, retrieved by Willis from a vending machine. He seems to know what it is, at least.

GREEN POTION x1

Restorative substance recovered from Jay's old room.

WRONG WAY SIGN

It doesn't look out of the ordinary, but you saw what that "out of order" note could do before, so...

GAUZE MOTH

A harmless if mildly annoying Hospital pest.

AUDIO TAPE

Retrieved from the library, contains a single note.