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: Mayonaka Densha
Complete Monster: Francis Reuben. A serial murderer and rapist with seemingly no motivation who also looks at one point like he's attempting to sell Jack's only female friend Neelah into prostitution, partakes in torture and seems to enjoy every second of it. The only way he could be eviler would be if he ate puppies for breakfast.
Judging by his murders, Jack the Ripper himself could count, but we know very little about him as a person at this point.
Ho Yay: It is strongly implied that Jack is in love with Tom, almost to the point that it stops just being subtext Hatsune is not above teasing him about it. It's stated that the two have slept in the same bed before on more than one occasion and Jack constantly wears the scarf that Tom have him as a child. And god help you if you touch his scarf. Aside from that, Jack is also a raging misogynist
Sherlock and Watson, despite the little panel time that Watson gets, still manage to have this in spades. At one point they even get an Under The Mistletoe scene. (Although it appears Sherlock invoked it deliberately just to annoy Watson).