Doctor Fenner

Doctor Fenner, alongside his "daughter" acts as the main antagonist of the Tales from the Darkside episode "Inside the Closet", he is the most seen character next to the protagonist and while he is ultimately revealed to be a genuinely loving "father" he is also shown as misanthropic and thus completely uncaring of the murder his daughter commits or his own responsibility in such activities.

History
Doctor Fenner is a reclusive and strange man who claims to work in veteterinarian sciences but also earns extra money by lending out one of his rooms to guests, though he is a strict landlord who has many rules and while happy to provide basic care for his guests is not much more them asking questions or interfering with his work, all in all he is shown to be a loner with a dislike of human company who really only tolerates having a guest for the extra money they provide.

When his guest starts to complain about strange noises in her closet he claims ignorance, though when she sets a mouse-trap in the closet he seems more concerned - though she catches nothing and he once again dismisses her concerns, claiming nothing out of the ordinary was occuring.

Unfortunately for his guest these strange phenomena were the result of a small but violent humanoid living in the closet, which the guest eventually stumbled upon one night and startled - causing the monster to kill her and drag her body into the closet.

Soon after Doctor Fenner is seen on the phone to the now deceased guest'  mother, claiming he cannot do much to aid in helping matters on her "disappearance" and lying that he had root surgery in order to evade further questions : after hanging up the phone Doctor Fenner lets out a startled cry as the small monster clings to his leg, yet it soon revealed the pair have a twisted "father-daughter" relationship as he affectionately picks the creature up and calls it a "beautiful" girl.. he is then seen carrying his "daughter" upstairs, like a proud and doting father.. completely uncaring to the fact that he was ultimately an accessory to murder (given his uncaring attitude it is very likely this has happened before but the story ends without clarifying such things.. leaving it to the viewers' imagination).