These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Devil's Backbone
Complete Monster: Jacinto. at first seems to be just a nasty jerk who cheats on his girlfriend with his teacher, but the truth is different. Jacinto, in his greed and lust for gold, is revealed as the murderer of the ghost boy Santi. He later blows up the orphanage and murders his own girlfriend without a twinge of remorse before trying to kill the other boys as they lure him to Santi's vengeful spirit.