What an Idiot!: Maria, did you really not see Juan Pablo appearing with a knife coming? Every single reunion between the two had a massive "THIS WILL ABSOLUTELY NOT END WELL" written all over it. Hell, Castel at different points acted like a textbook example of the murderer stalker, because HE IS THE TEXTBOOK EXAMPLE OF THE MURDERER STALKER. It is not hard to tell, really.
Complete Monster: "The Chemist" is a sadistic Neo-Nazi Mad Scientist known for killing many innocent children with lethal pathogens during his time in Colonia Dignidad. Eventually working for Atrem "Koba" Baturin, the Chemist would kill many more people with some of them even being Koba's soldiers; if his victims happen to be attractive men, he would rape them. The Chemist also supplied Koba with an airborne disease, that Koba used to cause an airplane crash which killed hundreds of innocents. When Koba gives the Chemist Karl Roebuck and Elise Wassermann to deal with, The Chemist proceeds to torture them before injecting Elise with a deadly disease through her eye.