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.
Complete Monster: Luzhin, dead front and center - he attempts to marry Dunya just so he can be idolized for his compassion in marrying a woman without a dowry, proceeds to freak out about Raskolnikov and insists that he be severed from the family, then tries to frame an innocent girl for theft.
If Luzhin is one, then Svidrigailov definitely is. Luzhin wants to marry Dunya to receive adoration, Svidrigailov tries to rape her, plus he was very heavily implied to already be a murderer prior to the novel's beginning. He simultaneously coaches Raskolnikov in the ways of monster-dom and mentally manipulates him for no reason other than that he feels like it. And he never drops his unflappably polite, creepy demeanor during all of this.
Seinfeld Is Unfunny: Rodya is a college dropout with mental issues, who thinks saving his sister from sexual abuse gives him an excuse to kill someone. Yes, I just described 50% of all Cold Case episodes.
The Woobie: The prostitute Sonya, who was forced into it by her family. Raskolnikov and (arguably) Semyon Zakharovich Marmeladov are of the jerkass variety.