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: Mad Father
Complete Monster: Herr Doctor father certainly counts. Between cheating on his wife and brutally murdering people in the name of "science" including a mother and her daughter, he certainly fits the bill.
Fanon: Various fan theories have been concocted attempting to tie Mad Father to Misao, which is set in the same universe in the future. Some of these include Ogre being Onigawa, Aya or her clone being the Library Girl, and Alfred Drevis being the Mad Scientist.
Hell Is That Noise: Aaaayaaaa... Doko ni iru no kanaaaa~?Translation Aaaayaaaa... Where are yoooou~?